Newall SUPER Security Mainspring #472 for Elgin 21/0s #5724 / 6005 - Alloy

Newall SUPER Security Mainspring #472 for Elgin 21/0s movements, Factory No. 5724 / 6005, alloy, new in envelope. See images for precise specifications. I specialize in hard to find watch parts and all watch parts are unconditionally guaranteed. Images do a satisfactory job of representing the item.