Comsco Mainspring #1015 for 10s Waltham Model 1874 Factory No. 2214 - Steel

Comsco Mainspring #1015 for Waltham 10s Model 1874 Keywind Movements, sometimes called the 10KW movement, Factory No. 2214, new in frail envelope. I specialize is hard to find watch parts and all watch parts are unconditionally guaranteed. Images do an adequate good job of representing the item.