Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 2
Lot 1259:
CLEAN UNIT OF TYPE: 1 on imperforate stamps 1918, 158 mostly mint stamps (28 – used), representing 15 strips of five, blocks of four or six and two panes of 25, including 7r in block of six with two labels – upper left stamp with inverted overprint, full/large part of OG or used, F/VF, C.v. $720++, Est. $300-$400, Bulat #34/48, var
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