BESTFIT Mainspring WA60 for Omega caliber 28.10 & 330 to 355 Automatic - Alloy

BESTFIT Mainspring WA60 for Omega caliber 28.10 and 330 through 355 Automatic (with bridle) plus perhaps similar ébauche watches, alloy, new in dirty envelope. See images for precise mainspring specifications and further details.  Plan to install these with a mainspring winder as they do not pop into the barrel due to a very strong bridle. 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 pretty good job of representing the item.