1888
China Imperial Post
cover 1896 (24 Dec.) long unaddressed XU5 with embossed seal of "INSPECTORATE GENERAL OF CUSTOMS/PEKING" on flap and showing on face eight proof impressions of the large circular "POSTAGE PAID" bilingual h.s. each overstruck by "I.G. OF CUSTOMS/PEKING" double ring d.s. Unusual.

細節
cover 1896 (24 Dec.) long unaddressed XU5 with embossed seal of "INSPECTORATE GENERAL OF CUSTOMS/PEKING" on flap and showing on face eight proof impressions of the large circular "POSTAGE PAID" bilingual h.s. each overstruck by "I.G. OF CUSTOMS/PEKING" double ring d.s. Unusual.