At Norkro, we have parts for repairing 400-day anniversary clocks. This mechanical clock keeps time with a mechanism called a torsion pendulum. It operates by the gears applying a pulse of torque to the top of the torsion spring with each rotation to keep the wheel going. This timepiece is an antique, offering a vintage style and charm to any area in your home. It should operate and function properly, but sending it in for a repair can cost hundreds of dollars. However, you can now get 400-day anniversary clock parts for much less. Shop our parts online, and we will ship them right to you for an easy update.