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

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