Question

the penny black was the first ..... in the world​

Answer 1

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• The Penny Black was the world's first adhesive postage stamp used in a public postal system. It was first issued in the United Kingdom (referred to in philatelic circles as Great Britain), on 1 May 1840, but was not valid for use until 6 May.....

Answer 2

adhesive postage stamp usef in public postal system