Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1058:
1921, blue surcharges 5000r over 5pi on 50k and 5000r over 7pi on 70k, two bottom left corner sheet margin blocks of four, control inscription of each block reads: ”Cred. Typ. 1910”, full OG, NH, VF and spectacular items, Est. $150-$200, Scott #289-90
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