American repeating split seconds chronograph watch Circa 1900

Yellow gold, diamond, and ruby set watch by Tiffany & Co.
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A fine American yellow gold, diamond, and ruby set open faced minute repeating split seconds chronograph watch, circa 1900. Called Tiffany Timer. This watch features a 16″ ligne jewelled lever movement. It includes a white enamel dial with radial Arabic numerals, an outer minute track with 1/5 second divisions, and subsidiary dials for a 12 hour register and constant seconds. The watch is adorned with Poire hands and split second hands. It has an 18 carat pink gold case, set with diamonds and rubies, a plain cuvette, and a hinged monogrammed case back. The case, dial, and movement are all signed.
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Diameter: 47 mm
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Signed: Tiffany & Co./Tiffany Timer
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The case is in overall very good condition, showing light surface wear and scuffing that is consistent with its age. It exhibits a warm patina throughout. The diamonds and rubies on the bezel are intact, but their quality or condition has not been tested. The case back features a blue enamel monogram ‘GL,’ with a small diamond set in the centre. There are four points for rubies, but one is missing. The cuvette shows indentations corresponding to the ruby setting on the case back. The inside of the hinged case back has some scuffing and scratches. The ruby setting pierces through the case number. 
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The dial is in very good overall condition. There are some inconsistencies in the outer perimeter between the 12 and 2 o’clock positions. A small chip is present on the edge of the 12 hour register at the 5 o’clock mark, and the outer edge of the 12 hour register exhibits some patina. Additionally, the hands show signs of ageing and discolouration. The minutes are repeating in phase. The split second chronograph is operational, but the hands do not reset properly and may require servicing at the purchaser’s discretion. The movement shows some light wear but is currently running.
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Tiffany & Co. opened its doors in New York City in 1837, and by 1876, the company had monopolised the luxury watch and clock trade in the United States. Their rise to fame was significantly boosted by the Tiffany Blue Book, a direct mail catalogue featuring the world’s rarest jewels, catering to the most distinguished clients globally.