Permotone Mainspring No. 241 for Marvin 520, 535 caliber movements - Alloy

Rezista Permotone Mainspring No. 241 for Marvin caliber 520, 535, both regular subsidiary and sweep second movements and perhaps similar ébauche movements, white alloy, new in envelope. See image for precise mainspring specifications. 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.