Penny Black
Noun
Meaning
Penny Black (plural Penny Blacks)
(philately) The world's first official postage stamp, issued in 1840 in the United Kingdom as part of postal reforms.
Examples
Muir, Douglas N, Postal Reform & the Penny Black, National Postal Museum, 1990, p.42 This first edition was marked "private and confidential," and was not released to the general public.
When the time comes for her to undergo a near-fatal "conversion" into the Amazonian ranks, she escapes, aided by Penny Black, who is wounded by Artemis in the process.