COLOMBIA, 1921, "Valor 30 Centavos" on 50c Pale Green, Short "A" in "Centavos", Black Air Post Surcharge (Colomphil 21a; Scott C20 var).
Sheet margin at left, tied by violet Medellin three-line handstamp on reverse of cover with National 3c (faulty) tied by blue boxed Barranquilla Nov. 21, 1921 datestamp, addressed to Barranquilla, violet "Hidroavion" handstamp, cover with slightly rough opening at top and vertical file fold clear of stamps, Fine and rare, only four covers
with this variety are recorded
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