NZ Airmail, 1931 3d, 4d, 7d set of 3 (with GV 2d added) on plain air FDC to GB canc Highfield cds 9 NO 31 (4 strikes). This was actually the day before the official 1st day. Very few covers are known with this date error (all posted by A.F.M. Paterson). With "Christmas Air Mail" flight cachet by GB receipt b/s 17 Dec. Fine & rare. Ex Horrell. Normal FDC with 10 NO 31 FD date cat $2000.

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