RN Mainspring No. 438 for Bulova 7AB, 7AE, 7AR - steel

RN No. 438 mainspring for numerous caliber Bulova 7 ligne watches; 7AB, 7AE, 7AR as well as perhaps others, steel, new envelope. See images for 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.