Swiss platinum minute repeating dress watch Circa 1916

Platinum with gold and enamel dress watch
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A very fine and rare Swiss thin 18-carat yellow gold, platinum, and enamel keyless minute repeating Art Nouveau style dress watch, circa 1916. Solid, polished case back with blue enamel and yellow gold monogram, the inside engraved with a dedication dated 1916, winding crown set with a large faceted diamond.
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Silver guilloché dial with applied yellow gold Arabic numerals on a plain outer reserve, sunk subsidiary seconds dial, and yellow gold Breguet hands. Nickel-silver movement, 29 jewels, straight-line counterpoised lever escapement, cut bimetallic compensation balance with eight adjustments, blued steel Breguet balance spring, repeating on gongs via activating slide on the band. Dial, case, and movement signed.
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Diameter: 46 mm
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Signed: Patek Philippe & Co Geneva, Switzerland
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Inscription in the interior of the back: Joseph J. Sterne, San Antonio, Texas, 1916. By Patek Philippe & Co, Geneva, Switzerland. From Stella, March Seventh.