A fine white gold tonneau automatic sweep seconds calendar wristwatch with moon phases, Franck Muller, 'Master Calendar', no. 82, ref. 2850 MC L, circa 1999

18k, circular nickel lever movement, glucydur balance, platinum rotor, silvered engine-turned dial, tumbling arabic numerals, inner ring calibrated for date, apertures below 12 o'clock for day and month, fan-form sector indicating phases of the moon, tonneau water-resistant-type case, case, dial and movement signed, with 18k white gold Franck Muller buckle.