Crossword Genius

Rare English postage stamp (5,5)

Ross

I believe the answer is:

penny black

(Other definitions for penny black that I've seen before include "first to get licked" , "World's first adhesive postage stamp, 1840" , "Today one would be unlikely to lick this" , "when without means to send a letter" .)

I've seen this clue in the Sydney Morning Herald.
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