A distinctively American clock which derives its name from the similarly shaped mirror with convex glass and gilded balls surrounding the frame. Somewhat similar to the banjo clock, though larger, the bottom frame is circular rather than rectangular and the base piece below (bracket) has carved acanthus leaves rather than the scrolled pediment of the presentation banjo form. They were made as eight-day timepieces having a pendulum 2in. Longer than the Willard patent. The case is somewhat larger and gold leafed, usually with an ornately carved eagle. By many this is regarded as the most handsome clock case ever designed in America. Exceedingly rare, there are believed to have been only 50 originals produced.