Marco Mainspring #183 for 5/0s & 6/0s Elgin Factory No. 2890 - Steel

Marco mainspring #183 for Elgin 5/0s & 6/0s movements, Factory No. 2890, steel, new in envelope. This particular strength was made for watches that were overbanking at full wind - but that's a little deceptive because they'll work for any application that takes a 2890. I likely have several of these so the one you get may differ slightly from the images. I specialize in hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a pretty good job of representing the item.