Alloy Mainspring 60104 for 16s Elgin Factory No. 817

Unmarked Maker Swiss Made Alloy Mainspring EL 60104 for 16s Elgin, Factory No. 817, DB&H end, new in envelope. See images for further details and precise mainspring specifications. 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.