Ingersoll Reliance Mainspring No. 1365 for 16s - Steel

Mainspring for 16s Ingersoll and Ingersoll Reliance Pocket Watches, Factory No. 1365, T-end, new in envelope. Says it measures 12 x 2 (that's the 12 & .023) but the strength tends to vary about 1/2 Dennison either way - the difference won't be an issue in an Ingersoll. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.