Tissot Watch Tradition Perpetual Calendar T0636371605700. This Tissot Timepiece from the Tradition range is the first one by the brand to include an analog perpetual calendar. It is equipped with the new, Swiss made ETA G15.561 quartz calibre that is powered by a battery. End of life (EOL) indication is available for the convenience of the wearer. The movement automatically takes in consideration leap years, which calls for no manual calendar adjustments. Month and day of the week scales are positioned respectively at the 10 and 2 o\'clock marks. A date scale expands from the 9 to the 3 o\'clock mark. Additional useful features include subsidiary seconds, black dial, solid case back, stainless steel crown and domed scratch resistant sapphire crystal glass.