Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 608:
1906-58, black overprint ”O.S.G.S.” on 10p violet and black; 49 stamps with black or red overprints ”S.G.” on long definitive sets of 1936-46, 1948 and 1951-58, neatly arranged on four pages from a Collection, full OG, NH, mostly VF, C.v. $410 (No. O17-24 as hinged), SG C.v. £510, Est. $400-$450, Scott #O2/O61
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