Tru-Time Mainspring for Bulova caliber 13AF - Steel

Tru-Time Mainspring for Bulova caliber 13AF and probably 13AT as well, plus perhaps others, steel, 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.