Description: Hole end mainspring is made in India using Japanese steel. Metric equivalent is: 19.0mm wide x 0.37mm thick x 1829mm long. Used on many Ansonia reproduction Swinger clocks. See #16819 for longer mainspring for original Ansonia Swingers.
Description: 3/4" x .0165" x 96" long loop end 8-day mainspring. Made of high grade Japanese steel. The lighter strength offers a more reasonable replacement for American clocks after a complete overhaul. Metric equivalent is 19.0mm x 0.41mm x 2438mm.
Description: 11/16" x .0165" x 96" long loop end 8-day mainspring. Made of high grade Japanese steel. Used on many Seth Thomas movements. Metric equivalent is 17.5mm x 0.42mm x 2438mm.