UK Piano Page Piano Forum

The only number I could find on the piano was on the inside and it was 50004. I am not sure if this is the serial number, but it seems likely.

I am in Massachusetts in the US and my family has a J&J Hopkinson piano. It's a small grand (approximately 5 feet long), and is completely inlaid. It's gorgeous. I'm less concerned with what it's worth than figuring out when it was made. Is there some way I can tell how old it is?