HR Mainspring No. 485 for ETA 746 - 1241, Bulova 4AM, Benrus BN - Steel

HR steel mainspring No. 485 for Bulova 4AM, Benrus BN, Gruen 915, 916, 917 and ETA 746, 1241 caliber movements, new in envelope. See images for precise calibers supported and 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.