1937 (April 28), Macao to San Francisco, registered first flight
cover, extensively franked with "Aviao" overprints, including
blocks of
1937 (April 28), Macao to San Francisco, registered first flight
cover, extensively franked with "Aviao" overprints, including
blocks of twelve and sixteen 5a values on reverse, tied by Macau
hexagonal datestamps, blue registration MACAU Central handstamp and
violet handstaped flight cachet, a most attractive franking, very
fine
