Swiss large and heavy keyless pink gold minute repeater Circa 1910

Very fine large and heavy minute repeating pocket watch
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A very fine large and heavy keyless minute repeating 18 Carat pink gold pocket watch, attributed to Ed. Koehn, Genève and retailed by A. Maurer Circa 1910. Four body, demi bassine, solid and polished case the front cover with engraved monogram and a hinged gold cuvette.
White enamel dial with painted Arabic numerals, outer minute track, large sunk subsidiary seconds dial and blued steel spade hands.
M. Rhodium-plated movement with Geneva striping decoration, 31 jewels, wolf’s tooth winding, straight-line lever escapement, cut-bimetallic compensation balance, blued steel Breguet balance spring, swan-neck micrometre regulator and repeating on gongs activated by a slide on the band. Dial, cuvette and movement signed: A. Maurer.
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Diameter: 54 mm
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Signed: A.Maurer
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The majority of minute repeating watches signed by A. Maurer were made by Ed. Koehn of Geneva. The present watch can be attributed to Koehn on that basis.