RN Mainspring No. 558 for Bulova 5AB & 6AL + A.S. 1012-1127 movements - steel

RN mainspring No. 558 for Bulova 5AB & 6AL, Benrus AE and AS 1012 - 1127 caliber movements, steel, new in 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.