Excelsior #2903 TIME Mainspring for Semca 1D Model 50 - Steel

Excelsior No. 2903 TIME side Mainspring for Semca 1D Caliber 50 Travel Clocks the 1930's and beyond. Could also very well fit in other travel & Alarm clocks. See image for precise mainspring characteristics. I specialize in hard to find parts so I usually have whatever you might need and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item.