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Waltham watches were made between 18 in the city of Waltham near Massachusetts in the USA.
There are many collectors of these antique watches and as a general rule of thumb the rarer and older the watch is then the more value it will have. I always use something made from a stiff plastic rather than a metal knife recommended by many people.
Remember, the serial number being referred to is the serial number on the movement (i.e. In the beginning of 2003, a few Waltham collectors, including Tom Mc Intyre and myself began development of the Waltham Database.
There you can look up more information about your Waltham, including model, size, and grade.
The Waltham Watch Company, also known as the American Waltham Watch Co.
The company established an expertise in machining quality high-precision parts that could be interchangeable in their watches.Problems were encountered with the new production methods.The company was exploring innovative new ideas in watch manufacturing, such as using jewels, making enamel dials, and producing plates with a high-level of finish which required extensive tooling and resulted in a great financial burden.Their revolutionary business plan was to manufacture the movement parts of watches so precisely that they would become fully interchangeable.Based upon the experience of earlier failed trials, Howard and Dennison eventually perfected and patented their precision watch making machines, creating what has been called the American System of Watch Manufacturing.