Tank Watches are a style of wristwatch that originated in the early 20th century, designed by Louis Cartier. They are characterized by their rectangular case, which resembles the shape of a military tank, hence the name. This design was revolutionary at the time and has become a classic in the world of horology. The first Tank Watch was introduced in 1917 and quickly gained popularity for its elegant and sophisticated look. Over the years, various models have been released, each maintaining the signature rectangular shape while incorporating different materials and features, appealing to both collectors and fashion enthusiasts alike.