Bidspirit auction | Worldwide Air Post Stamps and

Worldwide Air Post Stamps and Postal History - Netherlands - Rocket Flights - 1935-59, three covers and one piece, representing Flights P12, P14, ''Bruno'' Flight of 1945 and Rocket 612 ''PH-EL'' Flight, each one with various special markings and vignettes; in addition two Ruimtevaart labels in minisheets of 8 in rose or purple, issued in 1945(c), F/VF, Est. $300-$350