Wittner Maelzel pyramid-shaped mechanical metronome from the 800K/810K series. No batteries required.
Wittner Maelzel pyramid-shaped mechanical metronome from the 800K/810K series. No batteries required.
Wittner Maelzel pyramid-shaped mechanical metronome from the 800K/810K series. No batteries required.
Wittner Maelzel pyramid-shaped mechanical metronome from the 800K/810K series. No batteries required.