BESTFIT Mainspring 411H for AS 723, 979, GSW 23.7, A. Michel 270, MST 310, 329, Guba 525 - Alloy

BESTFIT Mainspring 411H for AS 723, 979, GSW 23.7, A. Michel 270, MST 310, 329, Guba 525 (Bauer 525, HFB 525) caliber movements, plus perhaps similar ébauche watches, white alloy, new in envelope. See image for precise mainspring specifications. I likely have several of these so the one you get may differ 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.