Open Loop Clock Mainspring – 5/16″ x .017″ x 42″ Long - No. MS-276

Open Loop End Clock Mainspring – 5/16″ (8mm) Width, .017″ (.43mm) Strength/Thickness, 42″ Length, P/N MS-276 (80-890), steel, new in bag. See images for further details. I specialize is hard to find watch & clock parts and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item