Leon Hatot ATO Lalique Opalescent Glass French Art Deco Mantle Clock circa 1935. A curved art deco mantel clock by Leon Hatot Lalique number 78289, made circa 1935. In opalescent glass with art deco raised numerals and black baton hands. Chrome movement case, the clock has the original ATO movement that is powered by a AA battery. Runs and keeps time. ” wide, 3 1/2″ deep and 7 tall.