Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Netherlands - 1934 (December 18-22), KLM First Flight Amsterdam - West Indies by Fokker F.XVIII ''De Snip'', 4 covers, including two pre-printed for the Flight from Gravenhage and Oosterhesselen; two with ''Par Avion'' pre-print from Groningen and Helden-Panningen, all addressed to Curacao, franked from 3 to 6 Dutch values, one has mixed franking, red and violet flight markings, F/VF, Est. $200-$300, Scott #C10