As it says in the blue banner at the top of this page, we are unable to place a value on your piano as an on site inspection is required. Valuations are based on the condition of the instrument and market forces where you live and we cannot assess that on this forum.
Your best option is to contact your local piano tuner and ask them for a proper inspection and valuation.
I would also bet that the piano would benefit from a good regulation.
I recall on another forum that a gentleman said his acoustic piano had not been tuned in over 20 years, as it just didn't need it, and swore it was in perfect tune!! I followed up with the comment, could he please tell us from where he purchased his ear trumpet. Needless to say I never had a reply.