
1) It fits in a fob 2) Item often with a hinged lid 3) Item on a chain 4) Personal timepiece 5) Timepiece attached to a vest
Found on
https://www.crosswordclues.com/clue/pocketwatch

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Found on
http://en.wikipedia.org/wiki/Pocketwatch

Earlier watches had been worn on a chain hanging around the neck.
Found on
http://www.antique-marks.com/antique-terms-p.html
No exact match found.