Rezista Mainspring No. 133X for Gruen caliber 275, 280, 285, 540 - Steel

Rezista No. 133X mainspring for Gruen 275, 280, 285, 540 caliber movements, and quite likely many others, 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. plethora