Miracle Power Mainspring #1085 for Gruen 430, 431, 435 & 440 - Steel

Miracle Power Mainspring No. 1085 for Gruen caliber 430, 431, 435 & 440 movements plus perhaps other similar ébauche movements as well, steel, 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.