Swiss repeater with split seconds chronograph Circa 1910

Open faced 14k pocket watch by Edouard Koehn
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A Geneva pocket watch with minute repeater and split seconds chronograph, circa 1910. Delivered to F. G. Smith Sons & Co, Detroit Mich.
14 carat pink gold case with case maker’s punch mark “1JS4”; white enamel dial with Roman hours, Arabic minutes, split-seconds chronograph, sunk subsidiary dial for the seconds and spade hands; 3/4 plate movement and a screw compensation balance. Movement and dial signed.
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Diameter: 54 mm
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Weight: 135 g
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Signed: F. G. Smith Sons & Co, Detroit Mich.
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The case of this watch was made by Andrew K. Shiebler & Son ; the company was the successor of Jeannot & Shiebler, who were renowned makers of gold cases in New York since the late 19th century. They owned the Dubois Watch Case Co. since 1904.
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Edouard Koehn (1839-1908) was born in Germany and studied at the horological school of Geneva. He began as a simple repairman with Patek Philippe and became a partner. In 1891 Edouard Koehn bought the company of H.R. Ekegren. The level of quality awareness he adopted during his many years with Patek Philippe is reflected later in his own designs and works.