1920 (27 April) Weltevreden to Telokbetong flight cover with two superb strikes of the special cancel (dated the day before), bs 28.4.20, rare with only 91 flown, light tropic spots else very fine (Mü. 2, 10’000pts) (Image)

1931 (Dec 6) Crash of KLM mail plane “Ooievaar” at Bangkok en route to Holland, cover (partly oil-soaked) from Bandoeng to Den Haag with special hs in Dutch: “Beschadigd door vliegramp “Ooievaar” on reverse, one (of two) stamps washed off, fine and very scarce as only part of the mail received any markings (Nierinck 311206a) (Image)

1936 (August) Zeppelin Hindenburg 7th North America Flight, cover flown from Soerabaya (strip of 3 triangular airs tied August 7) and sent via Bandung and K.L.M. to Amsterdam, reverse with August 13 Halle/Leipzig pictorial cds and final bs of Soerabaja (Sept. 28); Zeppelin cachet in lilac, cover torn and neatly mended, fine and exceptionally rare (Sieger 430, € 400) (Image)

1936 (Sept.) Zeppelin Hindenburg 8th North America Flight, reg’d cover with 1.10G total franking tied by uncommon Probolinggo cds (Sept. 3) and special registration form (on back) and sent via KLM to Amsterdam, with Halle/Leipzig transit (Sept. 14), Rhein-Main departure cds (Sept. 17) bs New York (Sept. 20 oval), sent back to Malang (Neth. Indies) via Seattle (Sept. 24) and arrived October 27! Fine and attractive showpiece (Sieger 437, € 400+) (Image)