1904年5月寄加拿大教会封, 贴香港2仙票, 盖5月22日上海中转日戳, 封背盖温哥华收8月18日Hamilton到达戳, 保存完好, 不常见.Hong Kong Treaty PortsShanghai1904 (May) envelope from the Inland Mission in Kanchow to Canada "<I>via Kiukiang, China" bearing Hong Kong 1900-02 2c. green tied by straight-line ink strike (to prevent pilfering) and Shanghai (22.5) c.d.s. and, on the reverse, Vancouver and Hamilton arrival (18.8). A fine and very unusual cover. Photo