Marco Marshalloy Mainspring 2717M for Gruen 335, 430, 431, 436 & 440 - Alloy

Marco Marshalloy Mainspring No. 2717M for Gruen caliber 335, 430, 431, 436 & 440 movements plus perhaps other similar ébauche movements as well, alloy, new in envelope. See images for precise mainspring specifications. 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.