HR Quick Fit Mainspring KA37E for Rolex 620, 630 Automatics - Alloy

HR Quick Fit Mainspring KA37E for Rolex caliber 620, 630, automatic, with attached bridle, white 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.