BESTFIT Clock TIME Mainspring for Oris caliber 800 Alarm Clock No. T540-1

Bestfit System #77 Mainspring for Oris caliber 800 alarm clocks, TIME side spring, Regular tongue end, No. T540-1, 1940’s or newer, steel. 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 is hard to find watch & clock parts and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item