USR Mainspring for 16s Ingersoll Reliance Mainspring #1365 - Steel

USR Mainspring for 16s Ingersoll and Ingersoll Trenton Reliance Pocket Watches, Factory No. 1365, T-end, new in envelope. It measures about 10.5 x 2 Dennison but the width and strength often tend to vary about 1/2 Dennison either way on this part number - 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.