PM Mainspring for Benrus caliber AK, Font 155 - ONYX Steel

PM mainspring for Benrus caliber AK, Font caliber 155 and perhaps others, ONYX steel, 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 is 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.