Stem - the metal rod connecting the crown to the watch winding and time-setting mechanism Lug - the insert at each end of the watch case that allows attachment of a strap or bracelet measured in mm. Crystal - the covering over the dial to protect it in plastic, mineral glass or sapphire Chronometer - a very accurate watch usually certified in Switzerland by the COSC Chronograph - A watch with subregisters to keep time in periods such as seconds, 30-45 minutes and 12 hours to keep time for specific functions and tells time like other watches also outfitted with a stopwatch function Subsecond - the small register at 6:00 at some watches for keeping the seconds Sweep second operates off the center of the watch like the hour and minute hand and is in continuous rotation Tritium - an isotope used for years to give illumination to watch hands and dials now being replaced by SuperLuminova |
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