Penny Black (1840)

The Penny Black, the world's first adhesive postage stamp of a public postal system, was issued by the United Kingdom of Great Britain and Ireland on 1 May 1840, for use from 6 May of that year. Although all London post offices received official issues of the new stamps, other offices throughout the United Kingdom did not, and continued to accept postage payments in cash only for some time. Post offices in some other localities, such as those in the city of Bath, began offering the stamp unofficially after 2 May.