Thanks for your question. Welcome to JustAnswer, it will be my pleasure to help you. My name is***** am working on this for you now.
How long is it since you purchased this piano? Has it been tuned since you obtained it?
In terms of value, I would need to assess the age and condition of the internal mechanical parts, so to be able to do this, would you be able to let be have some pictures of the internal mechanics? Could you please attach them on here using the paperclip or the +Add button on the menu bar in the reply section.