This Junghans parlor clock is large!
These clocks were made in two or three styles and the movement was used in several styles of Junghans clocks. This clock has two small dials at the top of the face for ‘silent & chime’ and ‘fast & slow’ adjustment.
The fast and slow adjustment is achieved by a cam that is attached to the back of the ‘fast & slow’ hand. When turned the cam pushes against a lever that raises or lowers the pendulum suspension spring thus raising and lowering the pendulum itself.