BESTFIT Mainspring 313B for Tissot 17.2, Gruen 455, Helvetia 105, Bulova 7AB & Kasper 500 - Alloy

BESTFIT Mainspring 313B for Tissot 17.2, Benrus "B", Bulova 7AB, Gruen 240, 270, 455, Helvetia 105, Kasper 500 plus perhaps similar ébauche watches, white alloy, new in envelope. See image for precise characteristics. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item