Nivaflex Mainspring for Waltham 12s Colonial B No. 2237 - Alloy

Nivaflex Mainspring for Waltham 12s Colonial B movements, Factory No. 2237, alloy, new in envelope. See images for precise mainspring specifications. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.