Vigor TONGUE End Clock Mainspring - 30 x 5/0 x 24" Long - T 390-1

Vigor Clock Mainspring, TONGUE End – Dennison 30 x 5/0 x 24" in Length, P/N T 390-1, steel, new in open envelope. See images for precise mainspring specifications. Yes, I realize is says L 390-1 on the envelope but that is an error as this is not a loop end mainspring. 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.