Throughout the 15th and 16th centuries, technology was developed which made the watch possible. The earliest portable timepieces were heavy 'clock-watches' which were attached to clothing or worn as a necklace, only displaying an hour-hand. By the 17th century, the pocket watch design was introduced, as well as a glass face to protect the mechanics. The most popular style of watch today - the wristwatch - has various rumours surrounding its origins in the 19th century; whilst this style was worn by women from early on, it did not find commercial success with a male audience until after the war. Over the last 200 years, a number of global brands have emerged which dominate the luxury watch market; amongst these are Tissot, Cartier and Rolex, which are popular with female watch enthusiasts.