Bidspirit auction | Worldwide Pioneer Flights - Bolivia

Worldwide Pioneer Flights - Bolivia - 1924, Aviation School issue, 10c-5b, complete set of seven, each one with reading up black handstamped overprint ''Muestra'', nicely centered, full OG, previously hinged, VF and very scarce, each one with expert's sign, Est. $250-$300 , Sc. #C1-7