c.1887 Keystone Watch Co. Patent “Dust Proof” Watch – 18-Size, Gilt-Damaskeened Plates, 10 Jewels
![c.1887 Keystone Watch Co. Patent "Dust Proof" Watch: Movement](https://blog.pocketwatchdatabase.com/wp-content/uploads/2022/09/DSC03371-1024x1024.jpg)
c.1887 Keystone Watch Co. Patent “Dust Proof” Watch – 18-Size, Gilt-Damaskeened Plates, 10 Jewels, ETP ~7,400. In addition to Abraham Bitner’s Patent Micrometric Regulator, this watch features many other patents issued to Bitner during his leadership at the Keystone factory.
![c.1887 Keystone Watch Co. Patent "Dust Proof" Watch: Dust-Proof Window Closeup](https://blog.pocketwatchdatabase.com/wp-content/uploads/2022/09/DSC03363-1024x1024.jpg)
The prominent “Dust-Proof” feature was accomplished with a windowed attachment covering the balance wheel – essentially “sealing” the mechanics of the watch from outside debris.
![c.1887 Keystone Watch Co. Patent "Dust Proof" Watch: Dial](https://blog.pocketwatchdatabase.com/wp-content/uploads/2022/09/DSC03369-2-1024x1024.jpg)
This watch is correctly fitted with “Keystone” shape gilt hands and is housed in a gold-filled case manufactured at the Essex Watch Case Company using the “Standard” name and trademark.
![c.1887 Keystone Watch Co. Patent "Dust Proof" Watch: Standard Case Marking](https://blog.pocketwatchdatabase.com/wp-content/uploads/2022/09/DSC03360-2-1024x1024.jpg)
In the late 1880s, the Atkinson Bros. company sold these as complete watches via various schemes, including the formation of watch clubs in major cities across the United States.
![Keystone Watch Co. Dust-Proof Advertisement in the Jewelers' Circular: May 1889](https://blog.pocketwatchdatabase.com/wp-content/uploads/2022/09/Keystone-AtkinsonBros-Ad-JC-May1889-1024x992.jpg)