BESTFIT Mainspring 310H for Gruen 807, 808, 809, 816 & AS 525, 588 - Alloy

BESTFIT Mainspring 310H for Gruen caliber 807, 808, 809, 816 and AS caliber 525, 588, Font caliber 407, 8144, 8244, 8254 movements plus perhaps similar ébauche watches, white alloy, new in envelope. See images for precise mainspring specifications. 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.