Swiss silver pocket watch with combined barometer Circa 1900

Silver open faced lever pocket watch
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An unusual Swiss silver keyless pocket watch with a combined barometer, circa 1900.
A polished case, engine-turned back with a vacant cartouche. White enamel dial with radial Roman numerals, outer silvered engraved barometer ring and gold spade hands. A gilt brass movement, 15 jewels, straight-line lever escapement, bimetallic balance, Breguet balance spring, and aneroid barometer mechanism fi fixed above the back of the movement.
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Diameter: 55 mm
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Signed: No name
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William Williams of Bury took out a patent on March 26, 1890, in England for an escapement that beats ten, twelve, or sixteen times a second. He added one wheel to the standard train, placed the escape wheel where the second hand is located and employed an extremely fast balance, beating 57,600 times per hour.