PM Mainspring No. 22 for Gruen caliber 405, 406, 410, 411, 420, 425 - ONYX Steel

PM ONYX steel mainspring No. 22 for Gruen caliber 405, 406, 410, 411, 420, 425 movements (and their variants) and quite likely others too, new in envelope. See images for precise mainspring specifications. 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 a pretty good job of representing the item.