English silver cased open faced lever deck watch Circa 1890

Silver complicated deck watch
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A rare deck watch with auxiliary seconds and centre seconds chronograph, circa 1890. Beating 57, 600 times per hour; 1/16th of a second accuracy is provided by a seconds ring that is two times divided in partitions 0 to 16.
A silver case, slide for seconds stop, enamel dial, roman numerals, 4/5 plate movement, English lever escapement, gold three  arm balance.
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Diameter: 58 mm
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Weight: 171 g
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Signed:  William Williams  Liverpool
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William Williams of Bury
On March 26, 1890 William Williams of Bury was granted a patent for an escapement which “beats ten, twelve, or sixteen times a second”. He achieved this by adding another wheel to the train and placing the escape wheel with the seconds hand. Williams also used an extremely fast balance, able to beat 57.600 times per hour.