Well, the hallmark is for Chester, and I think the G with the rounded cartouche is 1825, but it could be 1890 as well. There's a "C.C" makers mark for Colen Cheshire, but that shows as registered in 1894, and isn't in a diamond shield, so it may be a different maker.
Well, it is a late English pocket watch of a better grade. The main trouble with English pocket watches of that time is that a) they are never really slim and b) the English watch industry was no longer the best in the world. A good watch, well worth keeping but nothing exceptionally special.
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