Elgin Factory Mainspring for 11½ Ligne Grade 311 (AS 1904) - Alloy

Elgin  Factory Mainspring for 11½ ligne Grade 311 movement, Swiss (tongue) end, alloy, new in envelope. This Grade 311 (not to be confused with the much older 12s of the same grade) is an AS caliber 1904 based Swiss movement. See images for further details. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a satisfactory job of representing the item