Clocks and Watches

The clock is a timing device, and also a precise instrument for measuring and indicating time. Clocks and watches are usually distinguished by the size of the internal machine. According to international practice, clocks with movement diameter exceeding 80mm and thickness exceeding 30mm are clocks; Those with a diameter of 37~50mm and a thickness of 4~6mm are called pocket watches; Watch with diameter less than 37 mm; Women's watches are those with a diameter of no more than 20 mm or a movement area of no more than 314 square mm. The watch is one of the smallest, strongest and most precise machines invented by human beings