Swiss 18K gold watch with split-seconds chronograph Circa 1907

Gold split-seconds chronograph by Vacheron & Constantin
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An attractive and extremely rare Swiss keyless-winding pocket watch with split-seconds chronograph, circa 1907. This watch was completed in July 1907 and delivered on November 14, 1907, to F. W. Drosten Jewelry Co., Saint-Louis, Missouri (U.S.A.).
Enamel dial with Breguet-style radial hours, outer minutes/seconds track with red Arabic five minutes/seconds numerals, subsidiary seconds at six, 1/5 second chronograph (activated by the single round push-piece located on the winding-crown) – Split-seconds (started by the rectangular push-piece located on the case band at eleven), and pear hands. Round-shaped 18K yellow gold case. Lever escapement, index regulator with swan-neck spring and micrometric screw, adjusted no. 336784. Dial, case and movement signed. Accompanied by the extract from the Archives, dated November 10, 1994, that mentioned that this watch was made in 1907 and sold in 1907.
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Diameter: 48 mm
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Signed: Vacheron & Constantin – F.W. Drosten St. Louis