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Keystone Watch Case Co.
Keystone Watch Case Co.
18K
Keystone Watch Case Co. 18K
![Watch Case Marking for Keystone Watch Case Co. 18K: Keystone
18K
[Keystone Block]
Trade Mark](https://pocketwatchdatabase.com/assets/images/cases/Keystone-18K.jpg)
Note: Case manufacturers modified markings over time. As a result, the image above is simply a representation of one particular marking used by the company. Your case marking may differ based on the production era and other parameters.
18K
| Database ID: | PWDB-356 |
| Case Grade: | 18K |
| Material: | Gold |
| Gold Content: | 18K |
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