Worldwide Air Post stamps and postal history, Zeppelin Flight items, philatelic rarities of the World. Part 1
Lot 63:
1929, red surcharge ”50 Cts. 50” on 10c green, block of four, excellent centering and very fresh, full OG, NH, VF and rare multiple, only 100 stamps were surcharged, C.v. $2,800 as hinged singles, Est. $1,500-$2,000 , Sc. #C6
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