U.S., Airmail Envelopes, 1929, 5¢ Blue, Watermark 33, Border "D", Entire, #UC1, used with San Juan July 14 1936 cancel to S.F., no arrival marking, fine to very fine and scarce, 1990 P.S.E. cert. Scott $750. Estimate $250-300.
Harmer-Schau Auction Galleries, Inc. 1333 North McDowell Blvd., Suite B • Petaluma, California 94954
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