Where is the serial number located on the American Waltham pocket watch?

The serial number on an American Waltham pocket watch is typically located on the movement plate, which can be accessed by opening the back cover of the watch. It is usually found near the balance wheel or on the edge of the movement. Additionally, some Waltham models may have the serial number engraved on the inside of the case back. Always ensure to handle the watch carefully to avoid damage when checking for the serial number.