Swiss rare 14k gold chronograph “Compteur” Circa 1910

Open faced gold pocket watch by Alpina Union Horlogere
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A Swiss rare chronograph “Compteur” in pink gold, with original box, circa 1910.
14 carat pink gold case with case punch UH; original white enamel dial with Arabic numerals, sunk subsidiary dial for the seconds, single-button chronograph with 30 min register and gold spade hands; fine lever movement with intermediate wheel chronograph. Movement and dial signed.
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Diameter: 51 mm
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Weight: 82 g
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Signed: Alpina Union Horlogere