Illinois mainsprings and thousands of other watch parts, all here at Cas-Ker!
We offer the best service in the watch material business. We carry all available brands of watch material including crystals. Our selection of Seiko and Pulsar parts and crystals is unsurpassed. For fast and efficient service, send your next parts order to Cas-Ker, where material is our main business.
Click "View Options" or the product name to view mainspring factory numbers, sizes and strengths.