pocket watch
US /ˈpɑːkɪt wɑːtʃ/
UK /ˈpɑːkɪt wɑːtʃ/

1.
a watch designed to be carried in a waistcoat or trouser pocket, typically having a cover and a chain.
:
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He inherited a beautiful antique pocket watch from his grandfather.
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The detective pulled out a gleaming silver pocket watch to check the time.