Samson Mainspring No. A12 for AS caliber 1320, 1323, 1364, 1365, 1394 Automatic - Steel

Samson No. A12 steel mainspring with attached bridle for Bulova caliber 10BRC, 9AS, 9ASC, AS caliber  1320, 1323, 1364, 1365, 1394 Automatic movements and perhaps others, new in envelope. See images for precise 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.