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The jumping hour complication is a means of displaying the hour, shown through an aperture, which instantly changes every 60 minutes.
Watches featuring a small seconds have a smaller subcounter, usually located at 6h, which indicates seconds.
The date is a small window on the dial which indicates the day of the month (between 1 and 31).
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.