BESTFIT Mainspring 611P for Marvin 520, 535 caliber movements - Alloy

BESTFIT Mainspring 611P 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 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.