Dating Chinese Exort Silver.

I have a Chinese Export silver vase that has a impressed chinese mark and CS along with Shanghai.From the little i know CS is ment to be Cumshing of Canton.The vase has awas presented in Shanghai in 1907 and the inscription has been engraved on a shield.The vase is decorated whith dragon decoration.If it is cumshing i was told the time he was working was between late 1700 and 1830 so any information would be great.Thanks Gary