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.
Approximately when was your piano last tuned and maintained?
Have any of the internal mechanics been replaced or restored over the years or is it all still as originally built?
The serial number is ***** inside stamped or written on the wooden sound board, on the iron frame or on the plank near the tuning pins. Have a look at this website which should help:- www.pianoatlas.com/serial.htmlPiano manufacturers place serial numbers in a variety of places. Pianos often have numbers other than serial numbers, such as case, part numbers and Patent numbers but this does not give the detailed information needed for individual pianos. Try this site and it should open showing you the places to find the right Serial number which should allow me to correctly date your piano.
Also if you have any pictures, particularly of the internal mechanics which you could attach on here using the paperclip or the +Add button on the menu bar in the reply section, that would be very helpful.