Malaya. (Liberated Dutch Prisoners of War). 1945. Air Mail envelope addressed to a Liberated Dutch Prisoner of War "Camp Singapore' bearing Netherlands Yvert 138, 5c green, Yvert 140, 7 1/2c carmine, Yvert 333, 7 1/2c red, with 2 1/2c blue/ green and 7 1/2c orange/ red tied by Oegstrgeest double ring '28th Dec 1945' with 'Par Avion' label and triangular segmented hand-stamp applied on arrival with m/s 'Leftkamp'. The mail would have been sent via the Information Bureau, Dutch Red Cross, so its likely that the Liberated P.O.W. had been moved to a Thai Camp.
See David Tett for the only other example of this scarce mark.