Alloy Mainspring for 6/0s Elgin #2890 / 6098

Unmarked Maker Alloy Mainspring for 6/0s Elgin, marked SWISS, Factory No. 2890 / 6098, DB&H, new in envelope. See image for further details. 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.