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Horology A ~ Z

Horology M
Main Plate Essentially, the chassis of the watch; the base plate on which all the other parts of a watch movement are mounted.
Mainspring A watch's power supply, coiled up inside the barrel. When unwound, a common mainspring is about 9 to 13 inches. The longer the mainspring, the longer the power reserve.
Manual wind A movement is wound by hand through the crown.
Mechanical Watch A watch that runs from the energy released by its spring rather than electricity.
Meridian The line of longitude that passes through the observer's location or its representation on the sundial. Time meridian means the line of longitude which defines the time zone of any area.
Microrotor An automatic watch with a small, decentralized rotor, typically recessed within the movement for extra thinness.
Military Time A format of time based on 24 hour, e.g. 5:00 p.m. in Military Time format is 17:00
Mineral Crystal

A watch crystal made of mineral glass, which is cheaper and less durable than synthetic sapphire.

Minute Repeater A watch that strikes the time on command using different dings and dongs for hours and minutes: There is one tone for each hour, a double tone for each quarter hour, and another higher or lower tone for each minute; for example, Ding Ding Ding, Ding Dong, Dong Dong Dong Dong indicates that the time is 3: 19). Invented by Englishman Daniel Quare in 1690, it was an important device before watches could be read in the dark. Now it becomes a demonstration of watchmaking artistry and craftsmanship.

A complication that can be attached to a base movement as a complete unit.

Chronographs, Perpetual Calendars, Astronomical Displays, and Repeaters can all be modular in design.

Monopusher A chronograph with only 1 pusher for the start, stop, and reset functions.
Moon Phase Indicator A watch complication that displays the phases of the moon either through an aperture or, less commonly, with a small hand.
Movement The heart of a watch or a clock. It consists of the winding mechanism, the mainspring, the train, the escapement, and the regulating elements.
Movement blank Refer to Ébauche
NIB Abbreviation of " New In Box "
Nivarox A trade name for a hairspring alloy with superior temperature compensating properties, available in varying grades: I, II, etc.
NOS Abbreviation of " New Old Stock ", An old watch which has never been used, or even sold.

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