Assertion: pocket watch's case | /r/HasProperty | produced
Facets:
Source sentences:
text: The cases were produced using a range of metals, from nickel to 18K solid gold, and were marked with a grade such as the J. Boss inscription: pocket watches with this marking were known for their balance and guarantee for either 15, 20 or 25 years, as stated by the National Association of Watch and Clock Collectors.