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The date is a small window on the dial which indicates the day of the month (between 1 and 31).
Watches featuring a moonphase complication display new moons, first quarters, full moons and last quarters.
The power reserve indicator tells you the time the watch will continue to function. It can either be seen on hand winding or automatic watches.
The dead seconds is a hand that jumps forward when the second has elapsed. Generally the jump of the second hand is a distinctive feature of a quartz watch but in mechanical watchmaking, this function is a technical feat.