Nivaflex Mainspring for 6/0s Hamilton No. 2321 / 2521 - Alloy

Nivaflex mainspring for 6/0s Hamilton movements Part No. 2321 / 2521, alloy, new in envelope. See images for further details. 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 an adequate job of representing the item.