plate block

noun

noun

Hobbies, Lifestyle, Philately A block of stamps from the edge of the sheet which shows the plate from which the stamps were printed.

I gave up plate blocks long ago, but still obtain PNC's - but only one of each issue and without regard to the particular number.1997 June 18, R Sumner, “Re: Why collect new U.S.?”, in rec.collecting.stamps (Usenet):

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.