Penny Black
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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 on 1 May 1840 but was not valid for use until 6 May. The stamp features a profile of Queen Victoria.
In 1837,... Wikipedia
Year: 1840
Country of issue: United Kingdom
Date of issue: 1 May 1840 – February 1841
Estimated value: £40–£1000s
Face value: 1 penny
No. in existence: c. 1,300,000
No. printed: 68,808,000