PM Mainspring for Admiral 12s - ONYX Steel

PM Mainspring for Admiral 12s Pocket Watch movements and perhaps similar ébauche watches, ONYX steel, new in envelope. I likely have several of these so the one you get may differ slightly from the images. See images for precise specifications. 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.