Alloy Mainspring for CYMA caliber 719 & 758, 764 to 777

Unmarked Swiss Mainspring for CYMA (Tavannes) caliber 719 & 758, 765 to 777 movements plus perhaps similar ébauche watches, white alloy, new in package. 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 an adequate job of representing the item.