Vigor TONGUE End Clock Mainspring - 49 x 0½ x 27½" Long - T 580.1

Vigor Clock Mainspring, TONGUE End – Dennison 49 x 0½ x 27½" in Length, P/N T 580.1, steel, new in 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.