PM Mainspring No. 16 for Gruen caliber 210, 211, 212 - ONYX Steel

PM ONYX steel mainspring No. 16 for Gruen caliber 210, 211, 212 movements and quite likely others, 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.