COLOMBIA, 1921, (Hand) "Valor 10 Centavos" (Hand) on 50c Pale Green, Double Surcharge, Air Post Surcharge (Colomphil 3c; Scott C19 var).
Sheet margin at left, violet "Navegacion Aerea, Neiva" handstamp cancel, clear partial doubling of surcharge above normal and even traces of a third at bottom, minor light creases
FINE APPEARANCE. THIS IS THE UNIQUE DOUBLE SURCHARGE ERROR OF THIS ALREADY RARE STAMP.
Only six used examples of this stamp, in any format (incl. imperforate and inverted) are recorded with only one cover known. Illustrated in both Cruz-Bortfeldt and Fletcher.
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