Sandsteel Sandalloy Mainspring S2224 for Gruen caliber 405, 406, 410, 411, etc - Alloy

Sandsteel Sandalloy Mainspring S2224 for Gruen caliber 405, 406, 410, 411, 420, 421, 426 plus perhaps more Gruens and similar ébauche watches, alloy, new in envelope. See image 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.