COLOMBIA, 1921, "Valor 30 Centavos" on 50c Pale Green, Hooked "L" in "Valor", Black Air Post Surcharge (Colomphil 22; Scott C20 var).
Sheet margin at right, violet "Hidro(avion)" straightline cancel, Fine and scarce, only eight examples
are recorded, one of which is the unique example on cover
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