plate block

American  

noun

Philately.

1. 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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Example Sentences

Don Sundman, a veteran postage stamp dealer whose Mystic Stamp Company in Camden, New York, owned the Inverted Jenny Plate Block from 2005 to 2014.

From Washington Times

And another item, the 24-Cent Inverted Jenny Plate Block, fetched $4.9m.

From BBC

A plate block of the 24 cent Inverted Jenny stamp, which was issued in 1918 for the first U.S. air mail letters, sold for $4.9 million.

From Reuters

The “Three Treasures” sale also includes the British Guiana One-Cent Magenta stamp and a plate block of the “Inverted Jenny” stamp.

From Reuters

As for the Inverted Jennies, there is only one plate block, the corner of the original sheet with the number identifying the plate used on each page of stamps at the Bureau of Printing and Engraving.

From New York Times