Walnut Wittner "Pyramid" Plastic Metronome. 
Maelzel series with bell. Wood-grain plastic with matching wood-grain front cover. (855131)

Wittner Metronomes have been around for generations. Fine, German made, these metronomes last a life-time. The model 855 metronome gives musicians the traditional styling of a cone shaped metronome with the added durability of a plastic casing.  This metronome features the traditional cone shape, a wind up mechanism, swinging pendulum, a tempo range from 40-208 beats per minute, an audible click with a bell that rings (up to 6 beats per measure).