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  1. To determine the age of your Waltham pocket watch based on its serial number, follow these steps:
    1. Open up the back of the watch and locate the serial number.
    2. Use the National Association of Watch and Clock Collectors' searchable database to look up the number you find1.
    3. Check for additional markings such as "AWco" or a letter "K" followed by a number (9, 14, or 18) to indicate a golden case2.
    Learn more:
    To tell how old your Waltham pocket watch is, open up the back and locate the serial number. The National Association of Watch and Clock Collectors has a searchable serial number database that you can use to look up the number you find.
    www.1stdibs.com/answers/how-can-i-tell-how-old-…
    Waltham’s pocket watches have a sign AWco written on the cover on the inside. The letter K with an added number 9, 14, or 18 indicates a model with a golden case. Waltham pocket watches designed after 1852 came with a unique engraved serial number.
    www.nonamehiding.com/waltham-pocket-watch-id…
     
  2. American Waltham Watch Co. Pocket Watch Serial …

    Watch Co. Information, serial numbers, specs, and values of American antique pocket watches, with serial number lookups for manufacturers such as Elgin, Illinois, Waltham, and Hamilton.