Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2

Soviet Union 1923-91

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Start price: $50

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1937, Architectural Projects, souvenir sheet of four stamps of 40k violet, three examples with different bottom text shifts (types I, II and III), in addition one sheet has space 65.5mm and two others – space 64.5mm between top and bottom inscription, full OG, NH, VF, C.v. $C.v. $275 as for common sheets, Est. $100-$150, Scott #603, var