From what I can tell of your watch it appears to be a Fusee, or chain driven, watch. Most of these watches predate 1850. Watch movements and cases were sold separately. The buyer would select a movement then buy a case for it, so the marks on the watch case do not necessarily date the watch. Can you tell me all the marks that are on the movement of the watch, that would help very much in dating it, I cant quite make out the marks on the movement in the picture.
Thanks for the information, trying to check against the hallmarks was driving me mad I got totally confused ( old brain and no knowledge)
At least I have some info now.
Juco