NEWALL Mainspring #318N for Longines caliber 17L, 18.79, 18.89, 37.9ABC - Alloy

NEWALL Mainspring #319N for Longines caliber 17L, 18.79, 18.89, 37.9ABC 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 an adequate job of representing the item.