HR Quick Fit Mainspring K370 for ETA 717, Universal 291 - Alloy

HR Quick Fit Mainspring K370 for ETA caliber 717 & Universal caliber 291 movements, white alloy, new in open envelope. See images for precise mainspring specifications and further helpful information. 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.