COLOMBIA, 1921, 5p Olive Green, Third Issue Air Post (C35).
Mint N.H. bottom right corner selvage block of four, pos. 19-20/24-25, bottom left stamp showing the constant "Moon" flaw
to the left of plane's nose and bottom right stamp showing "Dot between OM of Colombia", Very Fine, rare as a block showing these constant varieties, Scott Retail as simply four hinged singles $1,300.00
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