Swiss rare 9K gold gentleman’s alarm watch Circa 1920

Open faced pocket watch by Brook & Son / Zenith
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A Swiss rare gentleman’s pocket watch with alarm, circa 1920.
Nine-carat gold polished case with dedication engraving on the gold dome. Signed enamel dial with luminous Arabic numerals, auxiliary seconds, subsidiary chapter ring with Arabic numerals for alarm and blued luminous skeleton hands. Frosted gilt half-plate movement with one hammer, one gong, tandem winding and screw compensation balance.
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Diameter: 50 mm
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Weight: 80 g
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Signed: Brook & Son, Edinburgh, Swiss Made
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Brook & Son was a renowned jewellery, watch and silverware company based in Edinburgh, Scotland. The company was based at 87 George Street. Brook & Son was founded in 1891 and operated until the end of 1939. The company was then taken over by Hamilton & Inches in 1940.