Wittner have been making metronomes to their high standard since 1895. They are considered by many to be the best 'traditional' style metronome.
The Maelzel series 810 metronomes feature a detachable front cover with a securing lock and a wind-up mechanism. This 811 model has a high gloss, mahogany-coloured wooden case.
The metal swinging arm has a weight which moves down along its length to match the desired bpm, which is clearly marked on a metal back plate.
In addition, there is an internal bell which can be set to ring on the first note of a bar using a metal pull-out button on the side (model without bell pictured).
Wittner metronomes with bell have the advantage of indicating 2/4, 3/4, 4/4 and 6/8 time (beat/rhythm).