BESTFIT Mainspring 55R for Felsa caliber 520, 523 - Alloy

BESTFIT Mainspring 55R for Felsa caliber 520, 523 movements, plus perhaps similar ébauche watches, white alloy, new in possibly dirty envelope. See image for precise characteristics. 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.