![File:Vintage Elgin National Watch Company Pocket Watch, Size 16s, 17 Jewels, Lever Set, 10 K Gold Filled Open Face Case Marked "Hamilton Keystone Watchcase, J. Boss, Railroad Model", Circa 1918 (13928707372).jpg - Wikimedia Commons File:Vintage Elgin National Watch Company Pocket Watch, Size 16s, 17 Jewels, Lever Set, 10 K Gold Filled Open Face Case Marked "Hamilton Keystone Watchcase, J. Boss, Railroad Model", Circa 1918 (13928707372).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/Vintage_Elgin_National_Watch_Company_Pocket_Watch%2C_Size_16s%2C_17_Jewels%2C_Lever_Set%2C_10_K_Gold_Filled_Open_Face_Case_Marked_%22Hamilton_Keystone_Watchcase%2C_J._Boss%2C_Railroad_Model%22%2C_Circa_1918_%2813928707372%29.jpg/858px-thumbnail.jpg)
File:Vintage Elgin National Watch Company Pocket Watch, Size 16s, 17 Jewels, Lever Set, 10 K Gold Filled Open Face Case Marked "Hamilton Keystone Watchcase, J. Boss, Railroad Model", Circa 1918 (13928707372).jpg - Wikimedia Commons
![Keystone Pocket Watch Case] I just inherited this Elgin pocket watch and was hoping to gain insight from this forum about the Keystone pocket watch case. I've not found an online guide Keystone Pocket Watch Case] I just inherited this Elgin pocket watch and was hoping to gain insight from this forum about the Keystone pocket watch case. I've not found an online guide](https://preview.redd.it/cgfjhyiec8z71.jpg?width=1080&crop=smart&auto=webp&s=0f122fe5ee3ad3de72a7c341c13a532564a50b85)
Keystone Pocket Watch Case] I just inherited this Elgin pocket watch and was hoping to gain insight from this forum about the Keystone pocket watch case. I've not found an online guide
![Vintage Pocket Watch-elgin, 12s, Circa 1924. 15 Jewels, in a Gold-filled Keystone Hinged Case. Fully Restored Runs Well. Great Gift - Etsy UK Vintage Pocket Watch-elgin, 12s, Circa 1924. 15 Jewels, in a Gold-filled Keystone Hinged Case. Fully Restored Runs Well. Great Gift - Etsy UK](https://i.etsystatic.com/27159951/r/il/894f90/3496921143/il_570xN.3496921143_dpxn.jpg)
Vintage Pocket Watch-elgin, 12s, Circa 1924. 15 Jewels, in a Gold-filled Keystone Hinged Case. Fully Restored Runs Well. Great Gift - Etsy UK
![File:Deer Engraving on a Vintage Keystone Pocket Watch, Case by the Illinois Watch Case Co., Elgin, Illinois, "The Winner" Case Guaranteed for 20 Years (8607094272).jpg - Wikimedia Commons File:Deer Engraving on a Vintage Keystone Pocket Watch, Case by the Illinois Watch Case Co., Elgin, Illinois, "The Winner" Case Guaranteed for 20 Years (8607094272).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/8/83/Deer_Engraving_on_a_Vintage_Keystone_Pocket_Watch%2C_Case_by_the_Illinois_Watch_Case_Co.%2C_Elgin%2C_Illinois%2C_%22The_Winner%22_Case_Guaranteed_for_20_Years_%288607094272%29.jpg)