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spif

noun informal, mainly British
  1. a postage stamp perforated with the initials of a firm to avoid theft by employeesFormer name: perfin
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Word Origin

C20: from s (tamp) p (erforated with) i (nitials of) f (irm)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012