HR Mainspring #621 for Bulova 8AL, Benrus BM, BI, AS 970, 1171 - Steel

HR Mainspring #621 for Bulova 8AL, Benrus BM, BI, AS 970, 1171 & FF 60 caliber  movements plus perhaps other ones as well, steel, new in envelope. See images for further data 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 suitable job of representing the item.