From my collection, I offer you this beautiful and rare model 950, 23 jewel watch in a nice Keystone "J. Boss" Mainliner 14K White Gold-Filled Case Movement: The 16 sizes, lever set configuration, with 23 Ruby & Sapphire jewels in gold settings, is adjusted for 5 positions and features a motor barrel and gold train. It is marked 950, Hamilton Watch Co. Lancaster, Pa. It runs well with strong motion, keeping good time. The serial number on the movement is 1576248 which dates the watch to about 1921. The last service date was 05/02/2023. The Run Quantity on this model is 1000 only. Case: The movement is housed in a Keystone "J. Boss" Mainliner 14K White Gold-Filled Case. There are no dents pocket faint scratches and a few pinhead nicks around the edge and case body. The back has no initials