COLOMBIA, 1921, "Valor 30 Centavos" on 50c Pale Green, Double Black Air Post Surcharge (Colomphil 20 var; Scott C20 var).
Noticeable doubling of surcharge, especially on "30 Centavos", violet Medellin three-line handstamp, two natural vertical pre-printing paperfolds, Fine and rare, only two examples
have been recorded
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