Elgin Factory DuraPower Mainspring for 4/0s No. 6096 - Alloy

Elgin DuraPower Factory Mainspring for 4/0s movements, Factory No. 6096, alloy, new in envelope. These were available in several different strengths and those that I can supply are shown in thw drop-down list. 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.