Swiss gold keyless pocket watch with Breguet dial Circa 1920

Gold open faced with a monogram
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A Swiss 18K yellow gold keyless pocket watch with Breguet dial, circa 1920. The back is engraved with a monogram MH. Hinged gold cuvette engraved Henri Mermin. White enamel dial with Breguet numerals, outer minute track, subsidiary seconds and blued steel Breguet hands. Matte gilt movement, wolf’s tooth winding, 15 jewels, moustache straight-line lever escapement, cut bimetallic compensation balance, blued steel Breguet balance spring, index regulator. Dial, case, cuvette and movement signed.
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Diameter: 46.5 mm
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Signed: Patek Philippe  Genève