Swartchild Black Shield Mainspring No. 6335 for 6/0s Ingersoll Alden - Steel

Swartchild Black Shield Mainspring #21235 for 6/0s Ingersoll Alden wrist watch, Factory No. 6335, steel, new in envelope. Could also very well fit in other watches as well. 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.