Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Poland - 1938-39, Stratosphere Balloon, souvenir sheet of 75gr deep violet, plus Gordon Bennett Balloon Post perforated and imperforate complete sets of three, full OG, NH (sheet and perf set) or LH, VF, C.v. $225 for souvenir sheet, Est. $200-$250, Scott #B31