We don't have synonyms for perfin yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are perkin, perfit and perlin.
(n) :
(philately) Perforated initial; a series of small holes punched into a stamp and forming a letter, series of letters or other design for the purpose of preventing the unauthorized use of the stamps.
(n) :
(philately) A stamp marked with perforated initials.
(n) :
(philately) Perforated initial; a series of small holes punched into a stamp and forming a letter, series of letters or other design for the purpose of preventing the unauthorized use of the stamps.
(n) :
(philately) A stamp marked with perforated initials.