You must use the serial number from the MOVEMENT of the watch... You usually have to take the back off the watch case to see the movement serial number which may appear anywhere on the watch movement. Be sure to use the serial number on the watch movement (the mechanism).
Although the lever watch was not invented in America, it was the USA who was responsible for the mass production of American lever watches.
You may enter data on watches you have (or have observed) if you know the movement serial numbers.
The observations may include information on cases, dials and further descriptions of movements.
The example below uses information from the American Waltham Watch Company, but that is just an example.
You should consult the serial number table for the specific brand of watch movement you are trying to date by selecting a company from the menu on the left.
The remarks may also include information on the history and provenance of a watch.