美国: 1887-91年美国寄中国进口邮件三件; 1/ 1887年寄厦门破剖封, 贴10 仙邮资, 销纽约邮戳, 经三藩市及香港往厦门. 2/ 无日期封寄上海, 贴10 仙邮资, 销Amherst 邮戳. 3/ 1891年2 仙邮资片寄上海, 销三藩市邮戳及紫色㰐圆形上海美国邮政代理日戳.China Postal History Incoming Mail United States: 1887-91 a small group with 1887 opened-out envelope to Amoy with 10c. franking tied by New York duplex, via San Francisco and Hong Kong with B.P.O. Amoy backstamp; undated envelope to Shanghai with 10c. franking tied by Amherst postmarks; 1891 2c. stationery card to Shanghai cancelled by San Francisco duplex and with a light strike of the "<H>u.s.postal agency/shanghai" dated oval in purple. (3 covers)