This is my great-grandfathers watch, his initials on the front. I would love any help in identifying its origin since there are no further markings apart from a few series of numbers.Inside back cover are four hand engraved (ab 1 mm high) number sequences, you need a magnifying glass to see them: Three on top of ea other are:11029; L.H.; 27257. To the right of them are: 31246 and below that 68680. Close to the hinge is : 192975.Any idea is much appreciated.