无日期无邮票寄镇江本埠信封, 贴第三版半分无齿横相连试样票一件, 销黑色镇江中英文无日期,戳, 旁盖椭圆框TO PAY戳; 封背有陈复祥印记, 罕见此试样票实寄封; 有小摺痕外, 保有完好.Chinkiang Postage Dues Covers Undated Binns unstamped envelope used locally bearing third issue ½c. imperforate plate proof pair tied by circular Chinkiang handstamp with a second strike alongside and "to pay" in oval. F.Z. Chun handstamp on the reverse. Rare use of this proof on cover. Photo