Ca. Ø57mm, ca. 123g, Breguet-style case, silver and pink gold, engine turned, coined band, 4 different French silver punches, extremely rare calibre, escapement and the entire motion train under 2 crescent-shaped bars, quarter-hour striking on 2 overlying bells, enamel dial, blued Breguet steel hands, intact, service rmended, dial with thin chipping at the winding hole, otherwise in good condition, extremely rare.