Vigor Open Loop Clock Mainspring - 21 x 0 x 21" Long - L 300.5

Vigor Clock Mainspring, OPEN LOOP End – Dennison 21 x 0 x 21″ Length, P/N L 300.5, steel, new in open 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.