A Metronome by Maëlzer. Wooden exterior with a clock work interior which includes a wind-mechanism.

Unfortunately the wind-up part of the mechanism seems to have snapped off at some point at the point where the key (not included) connects to the clockwork part. So whilst the metronome itself swings as it should (including the ticking sound) it does not keep going for very long. It also makes it impossible to know how accurately it keeps time.

Because of this, this metronome is only useful for restoration or for parts.