Bidspirit auction | Worldwide Pioneer Flights - Spain

Worldwide Pioneer Flights - Spain - 1926-27, Airplanes and Red Cross, 4p magenta and yellow, high value of the set; Coronation overprint varieties, error in brown on 20c (used), four inverted ones (three mint, one - used), and high value of the set with normal overprint, the total is 7 stamps, full OG or used, VF, C.v. $550, Est. $200-$300, Sc. #B18, B47a 53, a