Swartchild Black Shield Mainspring #19258 for 16s Ingersoll Reliance No. 1365 - Steel

Swartchild Black Shield Mainspring #19258 for 16s Ingersoll and Ingersoll Trenton Reliance Pocket Watches, Factory No. 1365, steel, new in envelope. Could also very well fit in other watches as well. Listed as 11 x 1 x 17-1/2 with T end. Envelopes have been well handled but the mainsprings are just fine. 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.