Vigor TONGUE End Clock Mainspring - 26 x 3/0½ x 25" Long - T 350-6

Vigor Clock Mainspring, TONGUE End – Dennison 26 x 000½ x 25" in Length, P/N T 350-6, steel, new in open envelope. Suitable for Kaiser 6/340 travel clock and likely others as well. 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.