Elgin Factory Mainspring for 5/0s Grade 823, 824 - Alloy

Elgin Genuine Factory Mainspring for 5/0s Grade 823 & 824 movements, alloy, new in envelope. These were basically Swiss ST 1686 caliber based movements so this will fit things many other than the specified Elgin grades. I likely have several of these so the one you receive may differ very 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