I am looking for information on a pocket watch that I am told was my grandfathers. It has a makers mark of G.T. on both the case and the inner working gears.What little research I have done has brought me to Gedeon Thommen Swiss Made Watch. Roman Numeral face, Silver carved outer case and I believe brass workings. The key is still attached, and while it can be wound, it will not hold a "charge" for very long. 10 rubis is engraved on the inner cover. Any ideas, or a general direction in which I should look, would be greatly appreciated. There is also a series of numbers engraved, but nothing came up when I searched them.
Thanks for your time,