1921年蒙自寄海防明信片1件，贴北京一版帆船1分3分各一枚，2分横双连，销蒙自3月15日小圆戳，经河口中转，有河口16日小圆戳，及海防18日到达戳，明信片图案为蒙自牌坊，邮戳清晰，保存完好，少见ChinaPostal HistoryRepublic of China1921 (15 Mar.) a picture postcard to Haiphong bearing Junk 1c. (3) and 2c. horizontal pair tied by Mengtsz c.d.s. with Haiphong arrival c.d.s. (18.3) and Hokow transit c.d.s. (16.3) on reverse. The picture on the postcard is an Archway in Mengtsz.
