Denmark issued ten definitive

Definitive stamp

A definitive stamp is a postage stamp, that is part of a regular issue of a country's stamps available for sale by the postal service for an extended period of time...

 airmail

Airmail

Airmail is mail that is transported by aircraft. It typically arrives more quickly than surface mail, and usually costs more to send...

 stamps

Postage stamp

A postage stamp is a small piece of paper that is purchased and displayed on an item of mail as evidence of payment of postage. Typically, stamps are made from special paper, with a national designation and denomination on the face, and a gum adhesive on the reverse side...

between 1925 and 1934 in two distinct series. The 1st series, commonly called The Plow and Airplane was first issued in June 1925. These stamps were designed by Danish artist Axel Peder Jensen (1885–1972). The 2nd series was issued on June 9, 1934 and depicted an airplane over Copenhagen

Copenhagen

Copenhagen is the capital and largest city of Denmark, with an urban population of 1,199,224 and a metropolitan population of 1,930,260 . With the completion of the transnational Øresund Bridge in 2000, Copenhagen has become the centre of the increasingly integrating Øresund Region...

. The second series remained in use until after World War II.

1925 Plow and Airplane series

The 1925 series comprises Denmark's 1st airmail stamps and their issue corresponded with the opening of Kastrup airport

Copenhagen Airport

Copenhagen Airport is the main international airport serving Copenhagen, Denmark and the Oresund Region. It is located on the island of Amager, south of Copenhagen city centre, and west of Malmö city centre on the other side of the Oresund Bridge. The airport lies mainly in the municipality...

 in Copenhagen

Copenhagen

Copenhagen is the capital and largest city of Denmark, with an urban population of 1,199,224 and a metropolitan population of 1,930,260 . With the completion of the transnational Øresund Bridge in 2000, Copenhagen has become the centre of the increasingly integrating Øresund Region...

 and the carriage of regular airmails by Det Danske Luftfartselskab

Det Danske Luftfartselskab

Det Danske Luftfartselskab A/S, or DDL, was Denmark's flag carrier airline since 1918, and is the oldest airline still in existence...

, the Danish national airline. The 1925 series was issued in denominations of 10, 15, 25, 50 øre

Øre

Øre is the centesimal subdivision of the Norwegian and Danish krones. The Faroese division is called the oyra, but is equal in value to the Danish coin. Before their discontinuation, the corresponding divisions of the Swedish krona and the Icelandic króna were the öre and the eyrir...

 and 1 krone

Danish krone

The krone is the official currency of the Kingdom of Denmark consisting of Denmark, the Faroe Islands and Greenland. It is subdivided into 100 øre...

. All the values were reissued in the 1930s.

Summary of 1925 Plow and Airplane Series
Denomination	Issue dates	Plate numbers and quantities printed	Primary purpose
10 øre	June 17, 1925, February 15, 1933	273J (151,000), 451J (18,450)	The 10 øre paid internal and Nordic Nordic countries The Nordic countries make up a region in Northern Europe and the North Atlantic which consists of Denmark, Finland, Iceland, Norway and Sweden and their associated territories, the Faroe Islands, Greenland and Åland...  airmail letter surcharges (1921) and the European airmail postcard Postcard A postcard or post card is a rectangular piece of thick paper or thin cardboard intended for writing and mailing without an envelope....  surcharge (1925)
15 øre	May 14, 1926, June 10, 1931, February 15, 1933	293A (107,250), 411N (27,170), 451J (23,460)	The 15 øre paid European airmail letter and postcard surcharges (1926)
25 øre	June 17, 1925, February 15, 1933	273J (150,000), 451J (25,620)	The 25 øre paid the 1925 European Airmail letter surcharge
50 øre	October 23, 1929, February 15, 1933	365Z (49,770), 451J (12,690)	The 50 øre paid the North American Airmail letter surcharge (1927) and combination European rates
1 krone	October 23, 1929, June 8, 1932, February 8, 1933	365Z (32,760), 435G (5010), 451J (21,030)	The 1 krone paid combination rates and high airmail surcharges to Asia, South America and Africa

Design and production

The Plow and Airplane design was created by Danish artist Axel P. Jensen and the stamps were printed by typography

Typography

Typography is the art and technique of arranging type in order to make language visible. The arrangement of type involves the selection of typefaces, point size, line length, leading , adjusting the spaces between groups of letters and adjusting the space between pairs of letters...

 by H. H. Thiele in panes of 30 stamps arranged in five rows of six. During the design and printing process, essays, proofs and color proofs of the stamps were made to finalize the design.

Constant Plate Flaws

The 1925 series is known for several constant plate flaws that appear on the same stamp in each sheet consistently. These plate flaws have descriptive names.

Usages

Image	Description
	Earilest known use of the 1925 series on a June 18, 1925 charity receipt.
	1925 use to Hungary. This 1925 registered letter Registered mail Registered mail describes letters, packets or other postal documents considered valuable and need a chain of custody that provides more control than regular mail. The posted item has its details recorded in a register to enable its location to be tracked, sometimes with added insurance to cover loss...  traveled via truck from Svebolle to Copenhagen, then by airplane to Berlin (DDL), to Vienna Vienna Vienna is the capital and largest city of the Republic of Austria and one of the nine states of Austria. Vienna is Austria's primary city, with a population of about 1.723 million , and is by far the largest city in Austria, as well as its cultural, economic, and political centre...  (Sachissche Luftverker AG) and Budapest Budapest Budapest is the capital of Hungary. As the largest city of Hungary, it is the country's principal political, cultural, commercial, industrial, and transportation centre. In 2011, Budapest had 1,733,685 inhabitants, down from its 1989 peak of 2,113,645 due to suburbanization. The Budapest Commuter...  (Magyar Legiforgalmi R. T. Malert Malert was a Hungarian airline, founded on November 19, 1922. The airline folded in 1944, and was a fore-runner of MALÉV Hungarian Airlines.... ). The 65 øre franking Franking Franking are any and all devices or markings such as postage stamps , printed or stamped impressions, codings, labels, manuscript writings , and/or any other authorized form of markings affixed or applied to mails to qualify them to be postally serviced.-Franking types and...  pays the 10 øre foreign printed matter Printed matter Printed matter is a term to describe printed material produced by printers or publishers, such as books, magazines, booklets, brochures and other publicity materials and in some cases, newspapers...  rate, the 30 øre registry fee Registered mail Registered mail describes letters, packets or other postal documents considered valuable and need a chain of custody that provides more control than regular mail. The posted item has its details recorded in a register to enable its location to be tracked, sometimes with added insurance to cover loss...  and the 25 øre European printed matter airmail surcharge.
	1928 use to Sweden. This envelope was mailed in Fredericia Fredericia Fredericia is a town located in Fredericia municipality in the eastern part of the Jutland peninsula in Denmark, in a sub-region known locally as Trekanten, or The Triangle...  and traveled via ship to Copenhagen, then via KLM flight #4 to Malmö Malmö Malmö , in the southernmost province of Scania, is the third most populous city in Sweden, after Stockholm and Gothenburg.Malmö is the seat of Malmö Municipality and the capital of Skåne County... . From Malmö it went by train to Stockholm, was undeliverable and then forwarded to Gothenburg Gothenburg Gothenburg is the second-largest city in Sweden and the fifth-largest in the Nordic countries. Situated on the west coast of Sweden, the city proper has a population of 519,399, with 549,839 in the urban area and total of 937,015 inhabitants in the metropolitan area...  where it was also undeliverable. Four days later it traveled via ship back to Fredericia. The 60 gram letter was franked with 75 øre to pay the 20-125 gram Nordic letter rate of 30 øre and three times the 15 øre/20 grams Nordic airmail surcharge.
	1929 use to Australia. This envelope traveled via Deutsche Luft Hansa Deutsche Luft Hansa Deutsche Luft Hansa A.G. was a German airline, serving as flag carrier of the country during the later years of the Weimar Republic and throughout the Third Reich.-1920s:Deutsche Luft Hansa was founded on 6 January 1926 in Berlin...  flights #8/12a to Basel Basel Basel or Basle In the national languages of Switzerland the city is also known as Bâle , Basilea and Basilea is Switzerland's third most populous city with about 166,000 inhabitants. Located where the Swiss, French and German borders meet, Basel also has suburbs in France and Germany... , then via train to Brindisi Brindisi Brindisi is a city in the Apulia region of Italy, the capital of the province of Brindisi, off the coast of the Adriatic Sea.Historically, the city has played an important role in commerce and culture, due to its position on the Italian Peninsula and its natural port on the Adriatic Sea. The city... , then via Imperial Airways Imperial Airways Imperial Airways was the early British commercial long range air transport company, operating from 1924 to 1939 and serving parts of Europe but especially the Empire routes to South Africa, India and the Far East...  flight #3 to Basra. From Barsa the letter went via ship to Australia. The 60 øre franking paid the 1927 foreign letter rate (25 øre) and the 1927 airmail surcharge (35 øre) to Iraq Iraq Iraq ; officially the Republic of Iraq is a country in Western Asia spanning most of the northwestern end of the Zagros mountain range, the eastern part of the Syrian Desert and the northern part of the Arabian Desert.... .
	1930 use to England. This registered letter traveled from Copenhagen to Stockholm Stockholm Stockholm is the capital and the largest city of Sweden and constitutes the most populated urban area in Scandinavia. Stockholm is the most populous city in Sweden, with a population of 851,155 in the municipality , 1.37 million in the urban area , and around 2.1 million in the metropolitan area...  and back to Copenhagen as undeliverable via A. B. Aerotransport. It was then forwarded to London via Amsterdam Amsterdam Amsterdam is the largest city and the capital of the Netherlands. The current position of Amsterdam as capital city of the Kingdom of the Netherlands is governed by the constitution of August 24, 1815 and its successors. Amsterdam has a population of 783,364 within city limits, an urban population...  on KLM flights #1/4. The 55 øre franking was 5 øre short because the letter required the European rates instead of Nordic rates. Note the Great Britain postage due markings and franking.
	1930 use to Latvia Latvia Latvia , officially the Republic of Latvia , is a country in the Baltic region of Northern Europe. It is bordered to the north by Estonia , to the south by Lithuania , to the east by the Russian Federation , to the southeast by Belarus and shares maritime borders to the west with Sweden... . This letter flew from Aarhus Aarhus Aarhus or Århus is the second-largest city in Denmark. The principal port of Denmark, Aarhus is on the east side of the peninsula of Jutland in the geographical center of Denmark...  to Copenhagen via DDL, then to Berlin, Danzig, Königsberg Königsberg Königsberg was the capital of East Prussia from the Late Middle Ages until 1945 as well as the northernmost and easternmost German city with 286,666 inhabitants . Due to the multicultural society in and around the city, there are several local names for it...  to Liepāja Liepaja Liepāja ; ), is a republican city in western Latvia, located on the Baltic Sea directly at 21°E. It is the largest city in the Kurzeme Region of Latvia, the third largest city in Latvia after Riga and Daugavpils and an important ice-free port...  via German-Russian Derluft flight #3B. The 65 øre franking pays the 30 øre 1927 foreign letter rate, the 1926 25 øre registry fee and the 1928 European airmail surcharge of 15 øre.
	1932 use to South Africa South Africa The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans... . This letter was from the first known through Danish airmail to Cape Town. The letter traveled via Luft Hansa flights #1/8 from Copenhagen to Amsterdam Amsterdam Amsterdam is the largest city and the capital of the Netherlands. The current position of Amsterdam as capital city of the Kingdom of the Netherlands is governed by the constitution of August 24, 1815 and its successors. Amsterdam has a population of 783,364 within city limits, an urban population...  via Hamburg Hamburg -History:The first historic name for the city was, according to Claudius Ptolemy's reports, Treva.But the city takes its modern name, Hamburg, from the first permanent building on the site, a castle whose construction was ordered by the Emperor Charlemagne in AD 808... , then on KLM flight #4 to Paris. From Paris the letter traveled via train to Brindisi, then via Imperial Airways flight #3 to Alexandria Alexandria Alexandria is the second-largest city of Egypt, with a population of 4.1 million, extending about along the coast of the Mediterranean Sea in the north central part of the country; it is also the largest city lying directly on the Mediterranean coast. It is Egypt's largest seaport, serving... . From Alexandria the letter went by train to Cairo Cairo Cairo , is the capital of Egypt and the largest city in the Arab world and Africa, and the 16th largest metropolitan area in the world. Nicknamed "The City of a Thousand Minarets" for its preponderance of Islamic architecture, Cairo has long been a centre of the region's political and cultural life...  and then by Imperial Airways flight #5 to Cape Town Cape Town Cape Town is the second-most populous city in South Africa, and the provincial capital and primate city of the Western Cape. As the seat of the National Parliament, it is also the legislative capital of the country. It forms part of the City of Cape Town metropolitan municipality... . The trip took 25 days.
	1934 use to Argentina Argentina Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires... . This registered letter traveled from Copenhagen via Luthansa flight #5 to Warnemunde Warnemünde Warnemünde is a sea resort and northmost district of Rostock in Mecklenburg-Vorpommern, situated on the Baltic Sea in the northeast of Germany at the estuary of the river Warnow.- History :...  instead of Berlin because of a weather interruption. It then went by train to Berlin and then on Air France flight#6 to Cologne Cologne Cologne is Germany's fourth-largest city , and is the largest city both in the Germany Federal State of North Rhine-Westphalia and within the Rhine-Ruhr Metropolitan Area, one of the major European metropolitan areas with more than ten million inhabitants.Cologne is located on both sides of the...  where it encountered another weather interruption. From Colonge it went to Paris via train. From Paris it flew by Air France flights #477/492 to Dakar Dakar Dakar is the capital city and largest city of Senegal. It is located on the Cap-Vert Peninsula on the Atlantic coast and is the westernmost city on the African mainland...  where it was placed on a ship to Natal. From Natal Natal, South Africa Natal is a region in South Africa. It stretches between the Indian Ocean in the south and east, the Drakensberg in the west, and the Lebombo Mountains in the north. The main cities are Pietermaritzburg and Durban...  it flew to Buenos Aires Buenos Aires Buenos Aires is the capital and largest city of Argentina, and the second-largest metropolitan area in South America, after São Paulo. It is located on the western shore of the estuary of the Río de la Plata, on the southeastern coast of the South American continent... .

1934 Airplane over Copenhagen series

The 1934 series was issued in denominations of 10, 15, 20, 50 øre and 1 krone. The issue was designed by Poul E. Johansen and engraved

Engraving

Engraving is the practice of incising a design on to a hard, usually flat surface, by cutting grooves into it. The result may be a decorated object in itself, as when silver, gold, steel, or glass are engraved, or may provide an intaglio printing plate, of copper or another metal, for printing...

 by Jons Britze.

Summary of 1934 Airplane over Copenhagen Series
Denomination	Issue dates	Quantities printed	Primary purpose
10 øre	June 9, 1934	580,850	The 10 øre paid the internal and Nordic airmail postcard surcharge (1934)
15 øre	June 9, 1934	461,150	The 15 øre paid the internal and Nordic airmail letter surcharge (1934) and the European airmail postcard surcharge (1934)
20 øre	June 9, 1934	450,450	The 20 øre paid the European airmail letter and printed matter surcharges (1934)
50 øre	June 9, 1934	467,350	The 50 øre paid combination rates and basic airmail surcharges to the Americas, Africa and Asia
1 krone	June 9, 1934	336,800	The 1 krone paid combination rates and multiple airmail surcharges to the Americas, Africa and Asia

Usages

Image	Description
	1935 use to French Indochina French Indochina French Indochina was part of the French colonial empire in southeast Asia. A federation of the three Vietnamese regions, Tonkin , Annam , and Cochinchina , as well as Cambodia, was formed in 1887.... . This letter, mailed in Copenhagen, flew via KLM flights #3/4 to Paris. From Paris it flew via Air France flights #O/M via Marseille Marseille Marseille , known in antiquity as Massalia , is the second largest city in France, after Paris, with a population of 852,395 within its administrative limits on a land area of . The urban area of Marseille extends beyond the city limits with a population of over 1,420,000 on an area of... , Athens Athens Athens , is the capital and largest city of Greece. Athens dominates the Attica region and is one of the world's oldest cities, as its recorded history spans around 3,400 years. Classical Athens was a powerful city-state... , Beirut Beirut Beirut is the capital and largest city of Lebanon, with a population ranging from 1 million to more than 2 million . Located on a peninsula at the midpoint of Lebanon's Mediterranean coastline, it serves as the country's largest and main seaport, and also forms the Beirut Metropolitan...  to Saigon. The 190 øre franking paid the 1934 foreign letter rate of 30 øre and the 1934 airmail surcharge to Indochina of 160 øre.
	The 15 øre airmail letter shows 1938 internal use and was flown from Aalborg Aalborg -Transport:On the north side of the Limfjord is Nørresundby, which is connected to Aalborg by a road bridge Limfjordsbroen, an iron railway bridge Jernbanebroen over Limfjorden, as well as a motorway tunnel running under the Limfjord Limfjordstunnelen....  to Copenhagen via DDL and then carried by train to Haderslev Haderslev Haderslev is a town and municipality on the east coast of the Jutland peninsula in south Denmark. Also included is the island of Årø as well as several other smaller islands in the Little Belt. The municipality covers and has a population of 56,414 . Its mayor is Jens Christian Gjesing,... .
	1938 use to Aruba Aruba Aruba is a 33 km-long island of the Lesser Antilles in the southern Caribbean Sea, located 27 km north of the coast of Venezuela and 130 km east of Guajira Peninsula... . This registered letter traveled via train from Nyborg Nyborg Nyborg is a city in central Denmark, located in Nyborg Municipality on the island of Funen and with a population of 16,492 . Nyborg is one of the 14 large municipalities created on 1 January 2007...  to Copenhagen and then on DDL flight #1 to Hamburg Hamburg -History:The first historic name for the city was, according to Claudius Ptolemy's reports, Treva.But the city takes its modern name, Hamburg, from the first permanent building on the site, a castle whose construction was ordered by the Emperor Charlemagne in AD 808... . From Hamburg it traveled by ship to New York New York New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east... , then by North American Aviation and Pan American flights via Miami and Curaçao Curaçao Curaçao is an island in the southern Caribbean Sea, off the Venezuelan coast. The Country of Curaçao , which includes the main island plus the small, uninhabited island of Klein Curaçao , is a constituent country of the Kingdom of the Netherlands...  to Aruba. The 292 øre franking overpaid by 7 øre. The 1934 foreign letter rate was 30 øre, the 1933 registry fee was 25 øre and the 1935 Netherlands Antilles Netherlands Antilles The Netherlands Antilles , also referred to informally as the Dutch Antilles, was an autonomous Caribbean country within the Kingdom of the Netherlands, consisting of two groups of islands in the Lesser Antilles: Aruba, Bonaire and Curaçao , in Leeward Antilles just off the Venezuelan coast; and Sint...  airmail surcharge was 230 øre.
	1938 use to China. This letter flew from Copenhagen to Berlin on Deutsche Lufthansa flight #7, then to Athens via Lufthansa flight #PF229. From Athens, Air France flight #486 took the letter to Hong Kong Hong Kong Hong Kong is one of two Special Administrative Regions of the People's Republic of China , the other being Macau. A city-state situated on China's south coast and enclosed by the Pearl River Delta and South China Sea, it is renowned for its expansive skyline and deep natural harbour...  via Beirut and Saigon. From Hong Kong it traveled by train through Amoy Xiamen Xiamen , also known as Amoy , is a major city on the southeast coast of the People's Republic of China. It is administered as a sub-provincial city of Fujian province with an area of and population of 3.53 million...  to Kulangsu. The 95 øre franking paid the 1934 foreign letter rate of 30 øre and the 1939 Hong Kong airmail surcharge of 65 øre.
	1941 use of the 1 krone value on a parcel card mailed from the Faroe Islands Faroe Islands The Faroe Islands are an island group situated between the Norwegian Sea and the North Atlantic Ocean, approximately halfway between Scotland and Iceland. The Faroe Islands are a self-governing territory within the Kingdom of Denmark, along with Denmark proper and Greenland...  during the World War II period of British occupation British occupation of the Faroe Islands in World War II The British occupation of the Faroe Islands in World War II, also known as "Operation Valentine," was implemented immediately following the German invasion of Denmark and Norway.... .