£130 - £150
Netherlands / Netherlands Indies. 1928 Covers from Soerabaja to Holland carried on the KLM return proving flights, comprising two November 2nd covers with Luchtpost overprint stamps carried on the first flight both signed on the reverse by the co-pilot (minor faults); and December 29th registered cover bearing the new airmail set of five, carried on the second flight, signed by the crew of four (one signature on reverse). Unusual pilot signed covers. (3).
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