BOREL Mainspring for 16s Hamilton No. 717042 for 992B / 950B - Alloy

BOREL Mainspring for 16s Hamilton 992B / 950B Movements, Factory No. 717042, 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.