Worldwide Air Post Stamps and Postal History, Philatelic Rarities of the World, Part 1
Lot 43:
1920, Compania Colombiana, 10c green, bottom left corner margin block of four containing two vertical se-tenant pairs, no gum as produced, NH, VF, C.v. $260++, Est. $100-$120, Scott #C11A-11B
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