Boston   mechanical metronome with bell (0-2-3-4-6), 40-208 bpm, black

Boston   mechanical metronome with bell (0-2-3-4-6), 40-208 bpm, pyramid model, wood grain

Wittner Taktell Piccolo   metronome, plastic casing, without bell, black

Wittner Maelzel   metronome, pyramid shaped, plastic casing, without bell, walnut grain

Wittner Maelzel   metronome, pyramid shaped, plastic casing, with bell, walnut grain