What is the face value of the world's first stamp "black penny"?

The face value of the world's first stamp "black penny" is1p.

The world's first stamp, commonly known as "black penny", was issued by British Post on May 1840, with a full set of 1 stamp. The main picture of the picture is the left relief head of Queen Victoria, then King of England. The stamp is printed with "postage" on the top and "penny" on the bottom (1p). Because the background color of the stamp is black, this stamp was later called "black penny". The inventor of this stamp is rowland hill, an English gentleman.

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