A 1919 Newfoundland "Hawker" 3c brown is to lead the fourth instalment of the Lionheart collection sale at Spink London with a £12,000-15,000 ($18,190-22,737) estimate.
Harry Hawker made an attempt to fly across the Atlantic in 1919
The lot was issued for the flight of Australian pilot Harry Hawker, who took up the £10,000 Daily Mail challenge to be the first to complete a non-stop flight across the Atlantic.
Unfortunately he ran into technical problems mid flight and was forced to crash land in the sea, where he was lucky enough to be picked up by a passing ship.
Only 200 of the stamps were ever released, making it one of the great Canadian air mail rarities.
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