Waltham Mainsprings

Cas-Ker is your source for Waltham Mainsprings and thousands of other pocket watch parts.

We offer the best service in the watch material business. We carry all available brands of watch material including crystals. For fast and efficient service, send your next parts order to Cas-Ker, where material is our main business.

Click "View Options" to view mainspring factory numbers, sizes and strengths.