Vigor TONGUE End Clock Mainspring - 25 x 3 x 23½" Long - T 340/1

Vigor Clock Mainspring, TONGUE End – Dennison 25 x 3 x 23½" in Length, P/N T 340/1, steel, new in frail open envelope. 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.