1888年美国波士顿寄日本实寄封1件,贴美国5分邮票1枚,销波士顿4月5日戳,经三藩市转,有横滨到达戳,而后改寄至中国上海,有上海日本客邮局6月5日戳,然后再经横滨改寄东京,辗转多次改寄,有多地中转戳,邮路清晰,十分难得ChinaPostal HistoryImperial Post1888 (5 Apr.) An envelope from U.S.A. to Japan, redirect to China and redirect to Japan, bearing a 5s stamp, tied by BOSTON MASS c.d.s., San Francisco, Yokohama Japan, Shanghai transit c.d.s., and Yokohama arrival c.d.s.