I have recently had the privilege to tune what i believe is a historical piano. The age of the piano is about 150 years old as given by the client. The remarkable thing about the piano is that it in 100% working condition and 100% tunable. For that age i believe that the owner or owners took great care of the piano. I will post a photo of the piano on Facebook on my group @pianowarrior.
I recently came across a much younger piano of which the parts were made of carbon fiber. Some parts already deteriorated so much that it needed to be replaced. Wood is still tops.