BOREL Mainspring for 18s Hamilton Factory No. 15 / 718011 - Alloy

BOREL Mainspring for Hamilton 18s movements, Factory No. 15 / 718011, T End, alloy, new in envelope. See images for further details. I may have several of these so the one you get may differ slightly from the images. 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.