Since ancient times, watches have evolved countless times, and the way they display time has also undergone constant transformation and innovation. Nowadays, we often see calendar display windows in the dial. When jump hour watches were popular, they were used to display time scales. The principle of jumping hour is similar to that of jumping seconds. After each hour, the digital dial with hour markers from 1 to 12 hidden behind the jumping hour window will quickly jump one grid to display the next time. Since the time scale is displayed by the jumping hour window, is there an hour hand on the dial? The answer is no. In other words, a jumping hour watch with only a single minute hand is very recognizable.