BESTFIT Open Loop Mainspring for Alarm Clocks No. 4.40mm x .25mm - L440-1

Bestfit System #77 Mainspring for Alarm Clocks, Open Loop End, No. L440-1, steel, new in really tight envelope. See images 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