Patek Philippe & Cie. Genève, Cal. 19''', 60 mm, 161 g, circa 1921. Geneva lever chronometer with extract from the chronometer archives by Andreas Hidding, copy of the Bulletin de Marche of the Geneva Observatory and Patek Philippe extract from the archives, timed by Henri Wehrli. Case: silver. Dial: silvered. Movm.: bridge movement, gold screw Guillaume balance, Geneva quality hallmark.