Not much to research , but I did find a 1867 with the serial number of 351, xxx , so I’m guessing this to be around 1870 to 1880. Smooth running, the case is very nice , the crystal has some lite scratches, but the dial looks not to be cracked, and in decent condition. It does measure 1 3/4 across the back of movement if you are looking for a size. The item “Vtg. 1870-80′s Home Watch Co. Key Wind Heavy Case Pocket Watch withKey Runs Well” is in sale since Tuesday, December 19, 2017. This item is in the category “Jewelry & Watches\Watches, Parts & Accessories\Pocket Watches\Antique”. The seller is “roxene59″ and is located in Newcomerstown, Ohio. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Russian federation, Israel, Mexico, New Zealand, Singapore, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Malaysia, Chile, Colombia, Costa rica, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion.
- Movement: Mechanical (Key-winding)
- Material: Fahy’s Oresilver
- Metal: oresilver
- Features: Railroad Watch
- Year of Manufacture: 1870-1879
- Serial Number: 503108