BESTFIT Mainspring 613H for AS 1051, Font 63, PUW 49 - Alloy

BESTFIT Mainspring 613H for Font 63, PUW 49, Durowe 55, Unitas 510 thru 535 and AS 1051 caliber movements plus perhaps similar ébauche watches, white alloy. See image for precise characteristics. I likely have several of these so the one you get may differ slightly from the images. 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.