Hermle 141-020 Clock Movement
The Hermle 141-020 clock movement is a 14 day movement. It is spring driven and it has a single gong on the half hour and the regular gong at the top of the hour. The equivilant Seth Thomas model is A208-002 and the pendulum length for this unit is 21cm. As you are looking at the movement in the video, it takes a #20 spring barrel on the right and a #21 spring barrel on the left.