The Two Penny Blue or The Two Pence Blue was the world's second official postage stamp, produced in the United Kingdom of Great Britain and Ireland and issued after the Penny Black. Initial printing took place from 1 May 1840, and in all 6,460,000 were printed from two plates until 29 August. Officially the stamps were valid for postage from 6 May but were only available from 8 May. It was first sold to the public at the London Inland revenue office on 6 May 1840. Except for its denomination, the design is exactly the same as the penny black and was struck from the same die.