A French marble and brass four-glass electric timepiece, L.R., circa 1910

9-cm annular silvered dial with Arabic numerals singed L.R., Bte S.G.D.G. ,S.M.A. Paris, blued hands and sweep seconds, a shaped balance with helical spring passing through an electrical magnet closing an electrical circuit and receiving an impulse at every oscillation driving the wheeltrain every half second, brass four-glass case with a shaped white marble base