Longines Factory Mainspring for caliber 19A & 19AS - Alloy

Longines Factory Mainspring caliber 19A & 19AS plus perhaps similar ébauche watches, alloy, new in envelope. The wonderful thing about factory mainsprings is they always fit! I likely have several of these than may be marked a bit differently 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.