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Main Spring
A flat spring coiled or wound to supply power to the watch.
Maltese Cross
The part of the stop works preventing the barrel from being over wound.
Manual Winding
A watch wound daily by winding the crown to tighten the spring.
Marine Chronometer
An accurate timepiece; may have a detent escapement and set in a box with gimbals that keep it in a right position.
Mean Time
Also equal hours; average mean solar time; the time shown by watches.
Mechanical Watch
A watch driven by a spring with a vibrating system that runs purely mechanically, such as a balance or a pendulum.
Mineral Glass
Far more scratch-resistant than synthetic glass. Hardness 5.
Minute Repeater
A timepiece that an be made to strike the time in hours, quarters and minutes, by means of a push piece or slide.
Moon Phases
A complication that represents waxing and waning of the moon as it circles the earth.
Movement
The fully functioning assembly of all the main timekeeping organs of a watch.
Musical Watch
A watch that plays a tune on demand or on the hour.
Pavé
A number of jewels or stones set close together, i.e. paved in diamonds.
Plate
A metal plate that supports the bridges and various parts of the movement.
Polished
Made smooth and brilliant by very fine-grained abrasives or by rubbing with a burnisher.
Power Reserve
Running time in excess of the normal time (24 hours for ordinary watches, 7 days for clocks wound each week) between two consecutive windings. In an ordinary watch, the power reserve usually provides for 10 to 16 hours running.
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