HR Mainspring No. 438 for Bulova 17AA - 17AI - 17AAI movements - steel

HR No. 438 steel mainspring for several 17 ligne Bulova pocket watch movements, specifically Bulova calibers 17AA, 17AE & 17AAI. See images for precise mainspring specifications. I specialize is 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.