Swiss split seconds chronograph with 12h register Circa 1899

Gold open faced split seconds chronograph by Patek Philippe
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A fine Swiss 18 carat gold open faced split seconds chronograph keyless lever watch with 12 hours register, circa 1899. Made for Tiffany & Co. Mechanical jewelled lever movement. Gold cuvette. White enamel dial with Breguet numerals, outer five minute divisions, two subsidiary dials for 30 minutes register and constant seconds. Plain case, split seconds chronograph mechanism operated through the crown and through a button in the band. Case signed and numbered by retailer, cuvette numbered, dial and movement signed by retailer.
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Diameter: 50 mm
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Signed: Tiffany & Co