Here a Hampden 18 size 17 Jewels Two-Tone "Special Railway" w/ Teske Regulator. Gold Register, Gilt Screws, & Gold Jewel Settings.  Serial Number 762778, Manufactured in 1890. This is No.20 of my Hampden Watch Collection. 

Watch keeps good time but the Mainspring slips & has to be wound many times till it catches & watch runs. 

Movement is Cased in a G.W. Ladd, 3-Hinge, Gold Filled Case. Ladd Cases are comparatively Rare. This example is in Very Good Condition w/ some Carry Ware & 2 small Rub Marks on Case Back.