1893年5月23日九江寄上海商业封, 贴半枚(垂直对剖)上海1892年2仙票, 销蓝色上海工部双圈戳, 另划三条蓝色横线于票面上, 封背有红色九江海关戳, 部份给5月25日的上海海关日戳所遮盖著, 另一旁有5月26日蓝色上海工部日戳及邮差铅笔手写记事; 一件异常重要的信封, 它实寄于九江工部邮政开办之前, 而利用上海工部与海关之联运互递系统邮递, 而没有贴海关邮票, 相信这是利用上海工部与九江海关互递邮件系统的存世唯一实寄封.Kewkiang Forerunner Mail 1893 (23 May) commercial envelope to Shanghai bearing Shanghai 1892 2c. green vertically bisected which is tied by double-circle "shanghai/local post" cancellation in blue and with three horizontal blue crayon lines (applied by the Kewkiang post office), the reverse with a fair strike of Kiukiang Customs c.d.s. in red, parly covered by Customs Shanghai c.d.s. (25.5) in black plus Shanghai Local Post c.d.s. (26.5) in blue and the postmans pencil delivery characters. A very important cover used before the opening of the Kewkiang Local Post and sent via the Customs Post to the Shanghai Local Post system (the 1. is for delivery in Shanghai) without the requirement for Customs stamps. This is thought to be the only such cover. Photo