Cal. 2126 nickel-finished lever movement 51 jewels 21K gold rim to the rotor silvered dial applied gold baton numerals outer tachymetre scale three subsidiary dials for constant seconds 30 minutes and 12 hours registers magnified window for date circular case enlarged stepped bezel snap on back two round chronograph buttons in the band 18K gold Audemars Piguet deployant clasp case dial and movement signed