Two groups of high-quality watches were produced by the company for orders placed by the Canadian Pacific Railway. You can find this information on the American Waltham page. This database only lists information on watch movements, not cases. Their revolutionary business plan was to manufacture the movement parts of watches so precisely that they would become fully interchangeable. Each serial number is a link to information about that observation. Volunteers have created a database of Waltham serial numbers,  models and grades,  and descriptions of observed watches.
One of the models is assigned the model year and the rest have the size of the model as a suffix.
Pocket Watch Serial Number Lookup Database
Do not use the serial number from the watch case. Archived from the original on May 10, The MIT team learned how to work with high precision machining while under the operation and direction of military contractor Raytheon Space and Information Systems Division Waltham Operations. The green background is project based information. The information displayed should be verified independently. The Pocket Watch Database has compiled data covering the major American pocket watch manufacturers and created an easy way to find information using the serial number on the watch movement.