Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 2
Lot 652:
1931, Airplane and Packet Ship, large die proof of 50c in black, printed on paper without watermark, size 78x54mm, guide line at top, mirrored No.920 at upper left, no gum as issued, VF and rare, NSSC #AM8dp16, US$850, Est. $300-$400, Sc. #C7
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