Commemorative coin

Commemorative coin

Commemorative coins are coins that were issued to commemorate some particular event or issue. Most world commemorative coins were issued from the 1960s onward, although there are numerous examples of commemorative coins of earlier date. Such coins have a distinct design with reference to the...

s were released in the USSR between 1965 and 1991. Most of them were made of copper-nickel alloy

Cupronickel

Cupronickel or copper-nickel or "cupernickel" is an alloy of copper that contains nickel and strengthening elements, such as iron and manganese. Cupronickel is highly resistant to corrosion in seawater, because its electrode potential is adjusted to be neutral with regard to seawater...

, but there were also silver coin

Silver coin

Silver coins are possibly the oldest mass produced form of coinage. Silver has been used as a coinage metal since the times of the Greeks. Their silver drachmas were popular trade coins....

s, gold coin

Gold coin

A gold coin is a coin made mostly or entirely of gold. Gold has been used for coins practically since the invention of coinage, originally because of gold's intrinsic value...

s, palladium coin

Palladium coin

Palladium coins are a form of coinage made out of the rare silver-white transition metal palladium. Palladium is internationally recognised as a form of currency under ISO 4217. Sierra Leone issued the first palladium coins in 1966. Tonga commenced issuing palladium coins a year later in 1967,...

s and platinum coin

Platinum coin

Platinum coins are a form of currency. Platinum has an international currency symbol under ISO 4217 of XPT. The issues of legitimate platinum coins were initiated by Spain in Spanish-colonized America in the 18th century and continued by the Russian Empire in the 19th century...

s. All of the coin

Coin

A coin is a piece of hard material that is standardized in weight, is produced in large quantities in order to facilitate trade, and primarily can be used as a legal tender token for commerce in the designated country, region, or territory....

s were minted either by the Moscow

Moscow

Moscow is the capital, the most populous city, and the most populous federal subject of Russia. The city is a major political, economic, cultural, scientific, religious, financial, educational, and transportation centre of Russia and the continent...

 Mint (Московский монетный двор (ММД)) or by the Leningrad

Saint Petersburg

Saint Petersburg is a city and a federal subject of Russia located on the Neva River at the head of the Gulf of Finland on the Baltic Sea...

 Mint (Ленинградский монетный двор(ЛМД)). Certain parts of the mintage of almost each coin were minted using the proof coinage

Proof coinage

Proof coinage means special early samples of a coin issue, historically made for checking the dies and for archival purposes, but nowadays often struck in greater numbers specially for coin collectors . Many countries now issue them....

 technology.