This is a grade 169, 18 size, 15 jewels, made about 1897.
It's a nice watch but the really interesting thing is the case.
The case is marked "Invisible Joint Case Company". These are scarce.
The case is designed so that the hinged parts fit very snug, making the joint "invisible". The hinge is cleverly internal so it does not show at all.
It is not known exactly who made these cases. There is evidence of them coming from more than one existing case factory.
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