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In 1849 Aaron Lufkin Dennison, Edward Howard and David Davis formed a company with a plan to use machinery to manufacture watch movement parts so precisely that they would become fully interchangeable.

They initially outfitted space for design and manufacturing in Howard's clock factory in Roxbury, Massachusetts, a community neighboring Boston.

It's a honest, original diver that looks great with everything from a t-shirt to a green military jacket.

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A lip or notch on the case back can be found at the 6 or 12 o’clock position. At or near the edge of the movement will be a serial number.If there is no lip, carefully wedge the blade into the seam and lift. Carefully examine the case back of a Waltham pocket watch. Press down on the crown and a tiny hatch will release the cover. Digits in the serial number will range from two to eight depending on the year of production.The effects of temperature on the rate of a watch and attempts to compensate for this are such a large topic that I have made a separate page about temperature effects.If you have any questions or comments, please don't hesitate to contact me via my Contact me page.Waltham etched a serial number on every watch movement along with its name and trademark.

Unlike other watchmakers, Waltham went the extra step by usually identifying the model of the watch on the movement as well.Pocket watch case backs vary in design and require different methods to open. For example, 1856-1857 Waltham pocket watches will have a serial number between 40. Note and record the model name, such as “Riverside” or another model name on the movement.For hinge back and bezel cases, examine the case back with a jeweler’s loupe or the naked eye for two small hinges on the case back. Pry the case at the opposite end of the case back first with a fingernail. A 1957 Waltham watch will have a serial number of 35,000,000 or greater, according to Use the jeweler’s loupe to note the “American Watch Co. Obtain a Waltham serial number list from the numerous online pocket watch sources or from an experienced watchmaker with an expertise in vintage watch identification and repair.The Waltham Watch Company, which was based in Waltham, Mass., produced pocket and wrist watches between 18.Today, Waltham watches remain highly desirable collectible timepieces. The watchmaker kept thorough records of its products.This information can be used to find the year that the watch was made.