Swartchild OPEN LOOP Clock Mainspring - 1/8" x .007" x 23½" Long - No. 80-988

Swartchild & Co. Clock Mainspring, OPEN LOOP End – 1/8″ Width, .007″ Strength/Thickness, 23½″ Length, P/N 80-988, steel, new in package. I have yet to find a clock that uses this mainspring but it was undoubtedly made for a small clock.  See images for precise mainspring specifications. I specialize in hard to find watch & clock parts and all parts are unconditionally guaranteed. Images do a pretty good job of representing the item.