Errors, freaks, and oddities
Encyclopedia
In philately
Philately
Philately is the study of stamps and postal history and other related items. Philately involves more than just stamp collecting, which does not necessarily involve the study of stamps. It is possible to be a philatelist without owning any stamps...

, "errors, freaks, and oddities" or "EFO" is a blanket term referring to all the kinds of things that can go wrong when producing postage stamp
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...

s. It encompasses everything from major design errors to stamps that are just poorly printed, and includes both some of the most sought-after and expensive of all stamps, and others that attract the attention of only a few specialists.


An error
Postage stamp error
A postage stamp error is any of several types of failure in the stamp printing process that results in stamps not having the intended appearance. Errors include use of the wrong colors, wrong denominations, missing parts of the design, misplaced or inverted design elements, etc...

is any sort of production mistake that is (potentially) replicated on many stamps; the famous Inverted Jenny
Inverted Jenny
The Inverted Jenny is a United States postage stamp first issued on May 10, 1918 in which the image of the Curtiss JN-4 airplane in the center of the design was accidentally printed upside-down; it is probably the most famous error in American philately...

 is the best known of these, having resulted from a sheet of partial prints being accidentally re-inserted into the printing press upside down for the second color, resulting in an invert error
Invert error
In philately, an invert error occurs when part of a postage stamp is printed upside-down. Inverts are perhaps the most spectacular of a postage stamp errors, not only because of the striking visual appearance, but because they are almost always quite rare, and highly valued by stamp...

. Design errors include wrong dates, wrong names, wrong pictures, anachronisms and the like. Color errors include stamps like the Treskilling Yellow which should have been green, as well as missing colors in modern multi-colored stamps. It is not especially rare for the perforating equipment to malfunction and result in imperforate errors
Postage stamp separation
For postage stamps, separation is the means by which individual stamps are made easily detachable from each other.Methods of separation include:# perforation: cutting rows and columns of small holes...

.

A freak is a one-time mishap in the production process. Freaks include paper folds resulting in half-printed half-blank stamps, "crazy perfs" running diagonally across stamps, and insects embedded in stamps, underneath the ink.

An oddity is something that is within the bounds of usability for the stamp, but still has a distinctive appearance. The usual sort of oddity is misregistration on a multi-colored stamp, which can result in shirts apparently with two sets of buttons, eyes above the top of a person's head, and so forth. These can be extremely common. The Canadian Christmas stamp of 1898, depicting a map of the world with British possessions in red, is famous for unusual color oddities that appear to claim all of Europe, or the United States, or central Asia for Britain.

Postal authorities generally take some care to ensure that mistakes don't get out of the printing plant; to be valid, the EFO stamps must have been sold to a customer. Mistakes smuggled out by unscrupulous employees are called printer's waste, not recognized as legitimate stamps, and may be confiscated from collectors; the Nixon invert
Nixon invert
The "Nixon invert" was a reputed invert error of the Richard Nixon memorial postage stamp issued by the United States in 1995. Originally reported in January 1996, it drew considerable attention that year; but in December a printing plant employee was arrested on charges of having stolen the...

 is a well-known recent example of an apparent new error that turned out to be simple theft by insiders. The authorities may attempt to lay hands on legitimately-sold errors, as happened with the original Inverted Jenny sheet, but usually collectors are smart enough to hang onto the windfall.

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