COLOMBIA, 1921, 15c Blue, Second SCADTA Air Post (C13). 34 stamps from different positions represented by blocks of four or six creating a reconstructed pane, neatly mounted on exhibit pages and highlighting constant positional flaws for each position, mostly Mint N.H., couple with minor toned spots on gum, also with two used singles (violet Barranquilla and red Girardot cancels) and a vertical strip of six which is believed to be the largest known used multiple, fresh and Fine-Very Fine, Scott Retail as singles $2,472.00

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