I have a HAC antique clock 1920's. I need help to order the correct replacement mainspring. The Diameter of the Barrel is 46.83 mm, the width of the spring is 17.00 mm, and the thickness of the spring is 0.50 mm. If anyone could point me to the correct replacement spring it would be greatly appreciated.
Most visitors online was 1660 , on 12 Dec 2020