COLOMBIA, 1921, "30 cent." on 10c Yellow, Air Post Registration (Colomphil 28; Scott C37 var).
Neat violet Bogota SCADTA and "R" handstamps, fresh color, Fine, this is the unique
example with the registration handstamp and illustrated in the Cruz-Bortfeldt book on pg. 75, a bit of an anomaly to researchers as the earliest "R" handstamp on cover recorded is July 1922 and no postal rate at this time included a registration fee indicating a possible trial handstamp, ex Gebauer, signed Schoendorf
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