1929 (July 8): First Flight cover from Nanking to Shanghai franked with1929 Sun Yt-sen mausoleum 2 x 1 cts. brown-orange + 2 x 4 cts. olive-green tied by Nanking date stamp together with 1921 airpost 15 cts. blue-green / black cancelled by commemorative cachet with "Shanghai 8.7.1929" arrival mark on front. Muller 12a.191: OVERSEAS A-Z, incl. Collections & Accumulations
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