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Here's the inside of it.

Thank you both for your help. Bill, I emailed you just now. The left key has numbers all over it in pencil. I don't know what I'm looking for. Here is the piano.

I am trying to figure out the age of my piano. I've found 2 numbers on it. Top left of the frame has 8832 in the wood. 25 is on a piece in the top left corner and on the wood under the keys, behind the door. I don't know which is the serial number. It says 'metal frame pianino' on it and 'methven si...