You need to locate the serial number inside the piano. Once you've located the plate, you can either look up the serial number yourself or contact the company directly.
In good condition I see these selling in an auction setting for around $1500 but you can expect more if yours is unique in some way or is in better shape than described.
You can contact the company directly but they will most likely ask you for the serial number foer your piano. So once you locate that you should be okay.
