Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 3
Lot 1341:
SELECTION OF VARIETIES: 1918-20, 11 mint stamps in singles, pairs and block of four, including ten inverted surcharges, one double and three surcharge shifts, No.36b has gum creases, sound condition overall, full OG, NH, VF and guaranteed genuine, C.v. $545++, Scott #20a/36d
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