A French electro-mechanical wall clock, mounted on heavy grey marble back plate with 10 inch dial marked 'Electrique Brillie' and covered by a glazed wooden lift-off case, the precision movement with invar rod and spherical brass pendulum bob above a horseshoe magnet mounted sideways and having one pole passing through a fixed electromagnetic coil. The power supplied by a single D-cell mounted behind the dial is sufficient to power the clock for up to seven years. A heart-shaped cam is activated by pushbutton to zero the seconds hand on demand. Height 46 cm. c.1920.