PHILIPPINES, 1926, 18c Light Brown & Black, Plate Proof on Glazed Card (322P4).
Two registered covers, each franked with horizontal pair and tied by Feb. 16, 1936 Manila slogan machine cancel, the British Royal Air Corps "Flying Boat" flight,
one for the Manila-Shanghai leg, other for the Manila-Hong Kong leg, multicolor cachets and boxed handstamps, appropriately backstamped and with Manila registry etiquette labels, slight overall toning, otherwise Very Fine, Scott Retail as normal proofs $1,400.00
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