National Time 500 Series Skeleton clocks, also known as silhouette, open face and marker clocks, are characterized by using the building facade as the clock dial. Numbers and minute markers are mounted to the wall to create a unique architectural element. A wide range of design and mounting options are also available. Dial markers can be affixed to a wall surface directly or other materials to provide contrasting background. Masonry details such as cast stone or soldier course brick is often used to frame clocks. Skeleton marker clocks can be provided with a through wall or front mount configuration as well as open or free suspension.

500 Series clocks are available as synchronous or minute impulse clocks. Complete your clock system with an MC3-X10 or MC3-MI Master Clock Controller for automatic time correction for daylight savings adjustments and after power outages. Synchronous 500 Series clocks are also compatible with 970 Series manual controls. Since 1930, National Time clocks are proudly made in the USA.