Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 49:
1929, red surcharge with ”Provisional” at 41 degree angle 75c on Colombia Air Post 15c carmine, block of four, full OG, NH, VF, C.v. $900 as hinged singles, Est. $500-$600, Scott #C2a
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