BESTFIT Mainspring 770 / 120 for Favre Leuba caliber 251 - Alloy

BESTFIT Mainspring 770 / 120 for Favre Leuba caliber 251 movements and several other similar ébauche calibers, alloy, new in envelope. Modern mainspring from the Bestfit #770 system, see images for further details. Note that #770 system mainspring are typically not pre-wound. I likely have several of these so the one you get may differ slightly from the images. I specialize is hard to find watch parts so I usually have whatever you might need and all watch parts are unconditionally guaranteed. Images do a satisfactory job of representing the item.