Welcome Scott, thank you for showing us your lovely watch. In its day, this will have been something special. You are correct in saying that it is 18kt (we see the Swiss hallmarks, including the ‘Helvetia’). I would estimate that it is earlier than you write - I guess nearer 1899.
It is an Omega watch (we see the marks on the movement and the case). The movement number will be under the dial. The dial is not signed Omega - which was often the case in those days. The dial is a gilded, engraved metal dial, fairly typical for that period.
There were several different sizes of movement - which appeared quite similar (15’’’, 17’’’, 18’’’, 19’’’ for example, each being measurements in Ligne) and I can’t tell which yours is. It appears to be quite small, so maybe 15’’’ (if you can give us the diameter of the movement (within the case: measure from side to side inside the case) it might help.
But that’s about it. Anybody here would warn you to get the watch serviced (not by a battery changer) before you use it (even if it runs fine) - because guess when it last saw any lubrication?!
I hope that helps. Tom
