Mercury airmail

The Mercury airmail design was the result of a competition for an airmail stamp design by the British Junior (now National) Philatelic Society. They are NOT essays. They were sold for a penny each at the 1923 International Stamp Exhibition.

They exist in several different colors, 2 different perfs and imperf, unwatermarked and watermarked airplanes, gummed and ungummed. There are also blackprints/proofs.

 File:Mercury airmail.jpg 

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