Hamilton 18s Pocket Watch Mainspring Part Numbers
The mainspring provides power to the mechanics of the watch. When a mainspring breaks or no longer offers enough energy for precise timekeeping, a replacement will be required. Measure the dimensions of the old mainspring using a micrometer, and use the chart below to find proper replacement for any American movement. Note: Using proper tools for mainspring installation is highly advised.
|Manufacturer||Movement Size||Part Number||Alt. Part Number||Length (in)||Width (mm)||Thickness [Strength] (mm)||End||Purchase on eBay|