1904 Mongtze B (Yunnanfu) (19 Feb) to USA. Registered cover, f.w. Navigation and Commerce ovpt. YUNNANSEN with Chinese value x3, tied by
1904 Mongtze B (Yunnanfu) (19 Feb) to USA. Registered cover, f.w. Navigation and Commerce ovpt. YUNNANSEN with Chinese value x3, tied by extremely scarce Mongtze B French PO cds. Showing "via Japan San Francisco" annotation. Transit Mongtze French PO (1 Mar), Haiphong (16 Mar), Hong Kong (22 Mar), Seattle (Apr). Arrived New York (27 Apr). Smiliar to the Laokay A post, French Indo-China established a post office in Yunnanfu in 1902 without permission from the Chinese Government. It was named Mongtze B to keep a low profile until a permission to set up a post office was granted. Mongtze B was renamed Yunnanfu. About 20 covers from “Mongtze B” are known to survive.1904.2.19 蒙自B局（雲南府）寄美國。掛號封，貼航海及商貿神像加蓋YUNNANSEN連中文面值四仙 + 六仙 + 十仙，銷極稀罕之蒙自B法國客郵局日戳。寫有“via Japan San Francisco”批示。3.1經蒙自法局，3.16經海防，3.22經香港，4月經西雅圖。4.27抵紐約。 一如老街A局，法屬印支郵政在未經清政府批准擅自在雲南府設立郵局，在日戳上雋刻地名“蒙自B”以掩人耳目。1904年，清政府才同意法國在雲南府設局，於是改回“雲南府”地名。 以“蒙自B” 地名發出的實寄封有20多件，是法國客郵中的罕品。
