Miracle Power Mainspring #137 for Elgin 6/0s movements No. 2890 - Steel

Miracle Power Mainspring No.137 for 6/0s Elgin Factory No. 2890, DB&H end, steel, new in envelope. See images for precise mainspring specifications. 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.