BESTFIT Mainspring 75R for Unitas 411, 417, Buren 30, Derby 27, Font 45, 46 - Alloy

BESTFIT Mainspring 75R for Unitas 411, 417, Buren 30, Derby 27, Font 45, 46, Zentra 193 caliber movements plus perhaps similar ébauche watches, white alloy, new in envelope. See images for precise mainspring specifications. 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.