Hamilton Factory Mainspring No. 2621 for 6/0s - Steel

Hamilton Factory Mainspring No. 2621 for 6/0s 19j movements and perhaps others, steel, new in (yet possibly quite frail) envelope. These were available in a couple of different strengths and those that I can supply are shown in the drop-down list. I likely have several of these so the packaging may differently slightly from the images. See image for precise characteristics. 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.