This was my grandfather's watch whom I never met since he passed before my birth. I apologize for not being a watch expert but I have dome my best to research this watch to help my father sell it for a price he would like. I have the following information it gave me below. The inside of the back case reads "Keystone Base Metal" 838926. My grandfather must have had the chain fixed at one time since it has a brass link in it where the remainder of the chain has a silver appearance to it.
The item "1913 Hamilton Railroad Pocket Watch & Original Chain 992 Family Heirloom" is in sale since Thursday, July 14, 2016. This item is in the category "Jewelry & Watches\Watches, Parts & Accessories\Pocket Watches\Antique". The seller is "hegman8" and is located in Kansas City, Missouri. This item can be shipped to United States, to Canada, to United Kingdom, DK, RO, SK, BG, CZ, FI, HU, LV, LT, MT, EE, to Australia, GR, PT, CY, SI, to Japan, to China, SE, KR, ID, to Taiwan, TH, to Belgium, to France, to Hong Kong, to Ireland, to Netherlands, PL, to Spain, to Italy, to Germany, to Austria, RU, IL, to Mexico, to New Zealand, SG, NO, SA, UA, AE, QA, KW, BH, HR, MY, CL, CO, CR, PA, TT, GT, HN, JM, BB, BD, BM, BN, BO, EC, EG, GF, GG, GI, GP, IS, JE, JO, KH, KY, LI, LK, LU, MC, MO, MQ, MV, NI, OM, PE, PK, PY, RE.