COLOMBIA, 1921, "30c" on 50c Pale Green, Air Post Surcharge (Colomphil 12; Scott C22b).
Violet three-line cancel of Bogota, some minor faults incl. light creases, small thin spot and central ink spot at top, Fine appearance, only a few examples believed to exist, similar to Colomphil No. 13 but differentiated from No. 13 having more of a "skeleton" outline of the surcharge likely caused by different inks used, listed but unpriced in Scott
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