1. Identify the serial number: The serial number is usually found on the piano's plate, which is located inside the piano. It may be stamped or engraved on the metal frame.
2. Check for any available documentation: If you have the original owner's manual, warranty, or other documentation related to the piano, it might include the manufacturing date or the date of purchase.
3. Research the company's history: You can try researching the history of Cable-Nelson pianos online or through music encyclopedias and reference books. This might give you an idea of the company's production periods and can help you narrow down the age range of your piano.
4. Consult with a piano technician or expert: If you are serious about determining the exact age of your piano, consider contacting a professional piano technician or appraiser who has experience with Cable-Nelson pianos. They might be able to provide you with more accurate information based on their expertise.