Rare Stamps & Postal History of the World

1920 10c Flier in Plane Watching Biplane, large margins all around, tied by violet Barranquilla oval handstamp, used with four National stamps, tied by oval violet March 4, 1920 datestamps on cover to Cartagena, with arrival postmark on back, v.f., signed Herbert Bloch, with 1982 Friedl certificate. One of only five covers recorded on the return flight,
Cat. Val. $2,750
Estimate: $2500