COLOMBIA - SCADTA, 1921-23, 30c on 50c PALE GREEN AIR POST WITH HANDSTAMPED "VALOR 30 CENTAVOS WITH SMALL "A" IN "VALOR"" SURCHARGE IN VIOLET, #C20var, Colomphil #20b, used with National 3c, both stamps tied by "clock" cancel on small piece fine-very fine and rare, ex. Santiago Cruz (Image)

$500