Hi ~! I have one also - open the top completely ...if it is a tall upright - 55" tall about .....
there is a serial number ....
then you can go to a site to find the age of pianos -
or look for a piano supply store on line - they will have a book that has a list of Alot of pianos with the serial numbers and dates of the make year -
Some piano tuners have this book -
actually - my tuner has this book -
if you want to call him -
301 879-1978 c.
Clyd Allen is the tuner - he is good and does repairs too
Good luck !
you will find my site and music below

heidimusic.webs.com