Cal. 33.3 CHRO T1 nickel-finished jewelled lever movement bimetallic compensation balance gilt dust cover the two-tone silvered dial with Arabic numerals blued steel feuille hands outer blue tachymetre scale and inner red and blue spiral telemetre scales two subsidiary dials indicating constant seconds and 30 minutes register in large circular case with flat bezel downturned angular lugs snap on back two oval chronograph buttons in the band 18K gold Omega buckle case dial and movement signed cuvette numbered