Unique Swiss gold, lapis lazuli and diamond lady’s pendant watch Circa 1905

Gold lapis watch with matching brooch
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A very fine Swiss, unique, keyless, 18K gold, lapis lazuli and diamond lady’s pendant watch, circa 1905. With matching 18K gold, lapis lazuli and diamond brooch. Lapis Lazuli by Vacheron & Constantin, Genève, retailed by Black, Starr & Frost in New York. A solid, polished case, back-rim decorated in scroll pattern set with eight round diamonds, lapis lazuli centre.
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White enamel dial with painted Breguet numerals, outer minute track with red Arabic 5-minute markers, sunk subsidiary seconds dial. Blued steel spade hands. A rhodium-plated movement, 16 jewels, straight-line lever escapement, cut bimetallic compensation balance, flat balance spring. Movement signed Vacheron & Constantin, dial and movement signed Black, Starr & Frost.
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Diameter: 31 mm
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Signed: Vacheron & Constantin  Genève