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Rattrapante: Split lap time function on a mechanical chronograph. Separate second hands are utilized to show split lap times.





Repeater: An auditory way of telling time. When a button is pressed a series of tones is heard signifying hours and minutes. It is definitely one of the most highly complex types of complications included in a watch movement. Watches that carry a repeater are often extremely valuable / expensive. Retrograde – Most commonly used to indicate elements of a date, a retrograde hand does not move through a full 360 degrees, instead it will move back to the start of it’s “sweep” begin again.





Rotating bezel: A bezel (the ring surrounding the watch face) that can be turned. Different types of rotating bezels perform different timekeeping and mathematical functions (see elapsed time rotating bezel," "unidirectional rotating bezel," "bi-directional rotating bezel" and "slide rule.")





Rotor: The part of an automatic (or self-winding) mechanical watch that winds the movement's mainspring. It is a flat piece of metal, usually shaped like a semicircle that swivels on a pivot with the motion of the wearer's arm.






Ruby: The red jewel used to prevent wear on some moving and contact parts in a mechanical movement. Rubies may be either synthetic or actual stone.















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