Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World. Part 2
Lot 1052:
1919, Second Berlin issue, imperforated proofs of 75sk, 3ak and 5ak, vertical bottom sheet margin pair with double center (one sideways), block of four with triple center (two inverted) and right sheet margin single respectively, printed on thickened yellowish paper without gum, VF, Lithuanian Specialized Cat. #P36b, P38e, P39a, Est. $100-$150, Sc. # 36, 38-39
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