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1893 (13 Dec) British Guiana 2c PSC from George Town to Customs Mengtsz, tied by George Town cds. Transit London (28 Dec), Hanoi (4 Feb), Laokay (14 Feb). It is the earliest incoming mail to Yunnan via Tonkin. Scarce. Illustration 3, p. 21 in "The Development of Yunnan Post System 1901-1949" by Mah Lang Moe. 2019 ROCUPEX TAIPEI & R.O.C.-Thailand Stamp Exhibition. 2020 (Aug) "Postal Service Today / Republic of China" Issue 752 p. 22 illustration.

1893.12.13 英屬圭亞那2分郵資片，自George Town寄蒙自海關，銷George Town日戳。12.28經倫敦，2.4經河內，2.14經老街。此為經印支東京進口雲南之最早例子。 馬蘭茂著《雲南郵政史1901-1949》第21頁圖三原件。 2019年中泰聯合郵展特刊第67頁原件。 2020年8月《今日郵政》752期第22頁原件。