#54 Hermle Mainspring

Upgrade your Hermle clock with the #54 mainspring, designed for optimal performance and durability. This mainspring measures 53/64″ (21mm) in width, .0165″ (.42mm) in strength, and 74-13/16″ (1900mm) in length. Perfect for ensuring smooth operation and extending the life of your clock, it’s an essential replacement for clock enthusiasts and restorers alike.