Tru-Power Mainspring U287 for Gruen caliber 235, 430, 431, 435, 440, 719 - Alloy

Tru-Power Mainspring U278 for Gruen caliber 235, 430, 431, 435, 440, 719, 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 an adequate job of representing the item.