BESTFIT Mainspring 412H for Aurore 17, Omega R17.3, Unitas 540 - Alloy

BESTFIT Mainspring 412H for Aurore 17, Omega R17.3, Unitas 450, AS 945, 1194 plus perhaps similar ébauche watches, white alloy. See image for precise characteristics. I likely have several of these and the envelopes look slightly different but they are all the same mainspring. 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.