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; however, the wristwatch did not find commercial success until after the war. Perhaps one of the most significant innovations in horological technology during the 20th century was the development of the quartz watch, resulting in a widespread rejection of mechanical watches. Over the last 200 years, a number of global brands have emerged which dominate the luxury watch market; these include Rolex, Patek Philippe, Breitling, Omega and TAG Heuer - all of which are swiss-made.