Possibly Fils d'Achille Hirsch. A blued steel open face single button keyless wind chronograph pocket watch Peut-être Fils d'Achille Hirsch. Chronographe de poche à cadran ouvert en acier bleui remontoir au pendant Date: circa 1900 Movement: Nickel lever, screwed balance, column wheel chronograph Dial: White enamel, black Arabic numeral hour markers, black outer 1/5th second divisions, subsidiary dials at 12 and 6 for seconds and 30 minute recording, gilt spade hands, centre blued steel chronograph hand Case: Matte blued steel, hinged cuvette and back cover numbered 7547 Size: 65mm For further information on this lot please visit Bonhams.com For further information about this lot please visit the lot listing