Since the appearance of early commercially designed wrist-worn timepieces (starting with ladies’ bracelet watches in the 1800s), many factors have influenced wristwatch styles such as wars, fads, art movements, technology, and economic conditions. This six-part series explores the historical progression of many wristwatch styles and reviews many of the characteristics that have developed since the 1800s. Before World War I, watch manufacturers in countries including Switzerland, England, and the United States were producing wristwatches in small quantities for a limited customer base. Wristwatches gained worldwide mainstream popularity following World War I, and production quantities steadily increased until they surpassed pocket watch production in the early 1930s. With the proliferation of cell phone usage starting in the 1990s, wristwatch popularity seemed to be in decline. Since 2013, however, Smartwatch popularity has helped put wrist-worn timepieces, of various and unprecedented styles, back in the mainstream, offering stylish models that appeal to all ages.