BESTFIT Mainspring 711H for Gruen 587, A. Michel 290, 291, Precimax 400, 450 - Alloy

BESTFIT Mainspring 711H for A. Michel 290, 291, Precimax 400, 450 and Gruen 587 plus perhaps other similar ébauche watches, white alloy. See image for precise characteristics. 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 a pretty good job of representing the item.