Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - United States - FIRST INTERNATIONAL ROCKET FLIGHT USA - MEXICO: 1936 (July 2-3), dark brown cover souvenir booklet, containing imperforate triangle single stamps and sheets of four 50c in red and blue (USA-Mexico) and in green and red (Mexico - USA), as well as two covers for direct and return flights, generally fresh and mostly VF, Est. $300-$400