Bidspirit auction | Worldwide Pioneer Flights - Germany

Worldwide Pioneer Flights - Germany - 1912, Air Post Semi-Official stamp, Margareten Volksfest Leipzig-Lindenthal, 50pf gray ultramarine, block of four, folded along horizontal perforation, fill OG, NH, VF and scarce multiple, Mi #4b, C.v. €1,200++, Est. $300-$400