cover 1873 (May) opened out, stampless envelope from Nagasaki (part company h.s. on reverse) to Belgium "Per Mail via Marseilles" bearing a fine strike of "Wm Pustau & Co./forwarded by/Shanghai" oval in red where it was put into the French mail and cancelled "SHANGHAI/CHINE AND BEARS EUROPEAN TRANSIT MARKS ON REVERSE; REPAIRED CORNER, UNUSUAL AND ATTRACTIVE