plate block

American

noun

Philately.

a block of four or more stamps containing the number or numbers of the printing plate or plates in the margin of the sheet.

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The plate block has changed hands several times since then, most recently when Weitzman acquired it in 2014.

From New York Times • Mar. 10, 2021

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023