Swiss silver lever chronometer pocket watch Circa 1921

Silver open faced pocket watch 
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A fine Swiss silver open faced keyless anker chronometer made by Patek Philippe in Geneva, circa 1921. Comes with an extract from the chronometer archives by Andreas Hidding, a copy of the Bulletin de Marche of the Geneva Observatory and a Patek Philippe extract from the archives. The case is smooth. The signed dial is silvered with Arabic hour numerals, an outer minute track, a sunk subsidiary dial for the constant seconds and blued steel spade hands. It has a signed bridge movement, gold screw Guillaume balance and is punched with the Geneva quality hallmark.
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Diameter: 60 mm
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Weight: 161 g
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Signed: Patek Philippe & Cie Genève
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In 1932, this watch participated in the category Second Class Pocket Chronometers of the chronometer test at the Geneva Observatory, timed by Henri Wehrli, placing 17th out of 28 chronometers.