COLOMBIA, 1920, 30c Black on Rose, First SCADTA Air Post (C14).
44 stamps from different positions represented in singles and blocks of four and six, neatly mounted on exhibit pages and highlighting constant positional flaws for each position, only missing pos. 19, 21-22 and 40 for a complete reconstruction, many appear Mint N.H., fresh and Fine-Very Fine, Scott Retail as singles $1,320.00
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