Netherland & Colonies, group pf 4 airmail covers, three of which signed by the pilots Captain Smith, Captain Robbs  and Captain 

• 1934, Australian First Flight Cover 20 October 1934 Official MacRobertson Air Race Holland to Australia via London. Carried by KLM DC2 "Uiver". On reverse arrival and flight postmark with pilot signature - Smith
• 1929 Gravenhage to Sabang Netherland Indies,  by steamer and  Airmail via the Rotterdam - Marseille   'EERSTE INDISCHE MAILVERZENDING per luchpost in 1929 ROTTERDAM-MARSEILLE', with pilot signature on reverse. 
• 1934 Netherlands, airmail by 'the Snip' airplane ( a Fokker F-XVIII) the first transatlantic flight of the West Indies Company of KLM from Schiphol to Curaçao. 1934. KLM KERSTPOSTVLUCHT NEDERLAND - WEST INDIE GRAVENHAGE 13.XII.1934. + NEDERLAND SURINAME CURACAO VLUCHT SNIP. 15 DEC 34. to Norwich, England
• KLM airmail from Amsterdam franked w. 85c to London where 6d postage due stamps were applied by the 'T' hand-stamp.