To find information you will need to provide the serial number which is on a steel plate by the turntable. If the machine was 1906 or before it would have an external horn. All others have internal horns. Again 1906 is the patent date. Most machines found are from the teens and twenties - not overly valuable in most cases.
Condition has a lot to do with value.
A warning - the date 1906 is a patent date, not the date the machine was manufactured. To find information you will need to provide the serial number which is on a steel plate by the turntable. If the machine was 1906 or before it would have an external horn. All others have internal horns. Again 1906 is the patent date.