pendulum-watch

pendulum watch

noun
(formerly) a watch having a balance wheel, especially a balance wheel bearing a fake pendulum bob oscillating behind a window in the dial.

Origin:
1655–65

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
pendulum watch

noun
(18th century) a watch with a balance wheel having a fake pendulum attached to it 
WordNet® 3.0, © 2006 by Princeton University.
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