Sarawak Airmails The R.A.F. Survey Flights 1936 (23 Apr.) envelope

(x) Sarawak Airmails The R.A.F. Survey Flights 1936 (23 Apr.) envelope flown from Kuching to Bintulu, marked "By RAF Flying boat No. K3592", franked at 5c. and showing arrival datestamp (25.4) on reverse; (13 May) envelope flown from Kuching to Singapore, marked "Per RAF Flying boat No. 3592" and franked at 5c.; and (1 Oct.) envelopes (2) flown from Kuching to Singapore, both marked "By RAF Flying Boat No. K4581", registered and franked at 20c. with arrival datestamp (2.10) on reverse Subject to 5% tax on Hammer Price in addition to 20% VAT on Buyer’s Premium.

Estimate:$399.84

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