Excelsior Mainspring #2920 for Cyma caliber R10 Clock

Excelsior Mainspring No. 2920 for Cyma caliber R10 Alarm / Travel Clocks the 1940's and beyond. Could also very well fit in other travel & alarm clocks. See images for precise mainspring specifications. I likely have several of these so the one you get may differ slightly from the images. 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.