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J
Term
Definition
JewelsBearings that are usually made of synthetic sapphires or rubies in a mechanical watch. The jewels reduce friction and make the watch more accurate and longer lasting. These jewels do not add any monetary value to a watch.
 
Jump Hour IndicatorA jump hour indicator takes the place of an hour hand. It shows the hour by means of a numeral in a window on the dial of the watch. The minutes and seconds in a jump hour watch are read as normal from the analog hands and dial.
 
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