What is the difference between quartz powered and mechanical watches?
A mechanical watch is powered by a main spring, which supplies energy to drive its movement, the spring can be self winding (automatic) or manually wound by the wearer. A quartz watch is powered electrically & its movements is regulated by an electronic circuit in order to maintain correct time. The first digital quartz watch with push-button-activated LED display appeared in 1972. It initially sold for US$2,100!