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

BESTFIT Mainspring 611P for Marvin caliber 520, 535 subsidiary and 520S, 535S 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.