A perfin is a series of perforated holes in the shape of a design, symbols or letters placed on the stamp for the purposes of preventing unauthorized use. Its origins date back to the mid 1850s in Britain where stamps were often used for small transactions. As people were able to trade stamps for money, perfin stamps became to be recognized as non-negotiable outside the mail room. Joseph Sloper produced the first commercially viable perfin machine.
Perfins continue to be used in a number of countries around the world for both official, semi-official and private use.
The term Perfin was officially coined by Hallock Card, an American, in 1943 who used it to describe the "PERForated INitials" on stamps. For a period of time the term SPIFS (Stamps Perforated with Initials of Firms and Societies) was used in Great Britain, but most people now use the term perfin.
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Louis Zandbergen, a perfin collector from The Netherlands, provided me with this wonderful scan of the history the Joseph Sloper Company
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