Elgin Factory Mainspring for 10½ ligne ETA 900, 925 - No. 6704 - Alloy

Elgin Factory Mainspring for 10½ ligne movements, Factory No. 6704, (tongue) end, alloy, new in envelope. I don't see an Elgin grade that's based on either the 900 or 925, there must have been one. That said, this likely fits quite a number of 900 series ETA movements such as 902, 903, 927-929, 938, 941, 968. See images for precise 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