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

Wittner Taktell Quartz QM2   quartz metronome, plastic casing, pitch generator A-440, 9V battery and earphone included, ruby