The first wrist watch ever was built by Pierre Cartier for the brasilian air plane pioneer Alberto Santos-Dumont. It was the "Cartier Santos" in 1904. Your turn.
From Wikipedia: The concept of the wristwatch goes back to the production of the very earliest watches in the 16th century. Elizabeth I of England received a wristwatch from Robert Dudley in 1571, described as an arm watch. The oldest surviving Wristwatch (then described as a bracelet watch) is one made in 1806 and given to Joséphine de Beauharnais. .
There is even an image in the article of an advertising flier for a wristwatch that was in use in the Boer War which began in 1899 and ended 1902.