Comsco Mainspring #1031 for Waltham 6/0s Jewel Series 1912 #2235 - Steel

Comsco Mainspring #1031 for Waltham 6/0s Jewel Series 1912 Model, No. 2235, steel, new in envelope. See image for precise characteristics. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate job of representing the item.