PM Mainspring No. 46 for FF caliber caliber 6¾ - ONYX Steel

PM No. 46 ONYX steel mainspring for caliber 6¾ and quite likely others, new in envelope. See images for precise mainspring 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.