HR Mainspring No. 545 for Bulova 7AC, 10AC, 10P, 10PP and a bunch more - Steel

HR No. 545 steel mainspring for Bulova 7AC, 10AC, 10AP, 10PP, 13A, 13AF, 13AL, 13AN & 13AT caliber movements, new in envelope. See images for all calibers supported and precise mainspring specifications. 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.