Samuel Watsonwas a horologist (clock and watch maker) who invented the 5 second repeater, made the first stopwatch. He made a clock for King Charles II

Charles II of England

Charles II was monarch of the three kingdoms of England, Scotland, and Ireland.Charles II's father, King Charles I, was executed at Whitehall on 30 January 1649, at the climax of the English Civil War...

  and was an associate of Isaac Newton

Isaac Newton

Sir Isaac Newton PRS was an English physicist, mathematician, astronomer, natural philosopher, alchemist, and theologian, who has been "considered by many to be the greatest and most influential scientist who ever lived."...

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Inventions

In 1695 Samuel Watson made the Physicians Pulse watch which was the first watch with a lever that stopped the second hand.
In 1710 Samuel Watson invented the 5 second repeater.

Royal connection

One of his astronomical clocks can be seen in the library of Windsor castle

Windsor Castle

Windsor Castle is a medieval castle and royal residence in Windsor in the English county of Berkshire, notable for its long association with the British royal family and its architecture. The original castle was built after the Norman invasion by William the Conqueror. Since the time of Henry I it...

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The original case for that clock may be at the Herbert Museum.

In 1686 he was sheriff of Coventry, before moving to Long Acre

Long Acre

Long Acre is a street in central London, England. Starting from St. Martin's Lane it runs from west to east just north of Covent Garden piazza, one block north of Floral Street. The street was completed in the early 17th century. It was once known for its coach-makers, and later for its car dealers...

, London in 1690/91.