BESTFIT Mainspring 57R for AS caliber 736 Stopwatch - Alloy

BESTFIT Mainspring 57R for AS caliber 736 stopwatch movements plus perhaps similar ébauche watches, white alloy, new in envelope. See image 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.