This wooden cased clock dates from the late 1950s or early 1960s.
It contains a solenoid operated kick-rewind movement where a spring is rewound every few minutes which drives a pin pallet escapement clock.
One end of the driving spring is attached to the arbor carrying the dumbbell shaped arm. This arm is kicked round in a clock-wise direction to rewind the clock. The weighted ends of the arm are for inertia only, not to give gravity assistance to the drive. As the driving spring unwinds, the dumbbell shaped arm rotates anti-clockwise and a contact on the arm touches another contact on the solenoid armature (visible immediately below the central pivot), completing the circuit and causing the solenoid armature to kick the arm round.