BESTFIT Clock Mainspring for Rensie 80 Alarm No. T300-2

Bestfit System #77 Clock Mainspring for Rensie 80 Alarm clocks, ALARM side spring, Regular tongue end, No. T300-2, 1940's or newer, steel. See image for precise mainspring characteristics. 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