From Sparks Auctions Sale #27 - Sparks Auctions - May 29-30, 2018
Lot 742 -
1930 50c on 30c Columbia Flight Surcharge, mint never hinged, fresh and fine-very fine. A lovely example of this stamp, with only 300 having been surcharged, of which 100 were used on cover and probably very few of the remaining 200 are this fresh and especially never hinged. Accompanied by a 2013 Greene Foundation certificate stating that it is from position 3 (lower left) of the overprint setting.....Unitrade $ 18,000
Sold for C$ 8,000
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