1870年日本寄美国费城实寄封1件,由中美汽轮运送,信封盖红色椭圆形china&japan steam service轮船戳,贴美国邮票10分1枚,有旧金山上岸投递邮局,销旧金山5月14日戳,有5月21日到达戳,戳记清晰,保存完好,附鉴定证书,少见China Postal History Imperial Post 1870 (14 May.) a cover to Philadelphia bearing 10c. tied by San Francisco c.d.s. and rare magenta oval ‘ CHINA & JAPAN STEAM SERVICE ‘ alongside, very scarce cover, with 2 certificates, the Philatelic Foundation 1980 and ASDA 1994































