Fine Swiss 18K yellow gold open faced pocket watch Circa 1910

Gold lever with open face by Agassiz Watch Co.
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A fine, high-quality, Swiss manual wind yellow gold pocket watch with enamel dial and extra movement, circa 1910. Made for Tiffany.
Nickel, extra, movement, 21 jewels, straight-line lever escapement, 8 adjustments, adjusted cut bimetallic compensation balance, blued steel Breguet balance spring, swan-neck micrometre regulator. Enamel dial with Roman Breguet-style hours, outer minutes track, subsidiary dial for the seconds, blued spade hands, and signed Tiffany & Co. Switzerland. Solid 18K yellow gold polished case and hinged gold cuvette. Dial, case (with initials) and movement signed.
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Diameter: 44 mm
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Signed: Agassiz