BESTFIT Open Loop Mainspring for Junghans 231 German Alarm Clock No. L500-3

Bestfit System #77 Mainspring for Junghans 231 German Alarm Clocks, Open Loop end, No. L500-3, 1960’s or newer, steel. See image for precise mainspring specifications. I specialize is hard to find watch & clock parts and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item