Perfin
Stamp with a name perforated across it / From Wikipedia, the free encyclopedia
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In philately, a perfin is a stamp that has had initials or a name perforated across it to discourage theft. The name is a contraction of perforated initials or perforated insignia. They are also sometimes called SPIFS (Stamps Perforated with Initials of Firms and Societies).[1]