Marco Mainspring #2734 for AS 345, 364, 375, 388, 392, 411, 574, 902 - Steel

Marco Mainspring No. 2734 for AS 345, 364, 375, 388, 392, 411, 574, 902, Gruen 153, 163, 165, 167,168, Westfield 98 caliber movements plus perhaps other similar ébauche movements as well, steel, new in envelope. See images for all supported calibers and 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.