Abstract: A housing encloses at least two heavy numeral-carrying drums, visible through a window, the drums rotating in horizontal planes on a vertical axis. Control mechanism, exterior of the housing, is arranged to advance acute-angled, detent halting members within the housing, in a rectilinear path radial to the drums, to enter one of a plurality of obtuse-angled teeth in juxtaposed thin wafer like annular ring gears on the drums to simultaneously halt all of the drums, with the numerals in the window. Each halting member is associated with the ring gears of two adjacent drums. A common yoke actuated by an elongated, push button, Bowden wire connection simultaneously actuates all the halting members. Similar exterior control means may be used to initiate the rotation of the drums within the housing.