Not sure...but I have one from when I was a kid (about 35 years ago) that I was thinking about putting in my rummage. I think it works well.
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I just got a Jaymar Piano with the same patent number and looked it up on the US Gov. web site. It was made in 1953. The only problem is that patent #2,641,135 is for an automotive power antenna not a toy piano. I think they just made up the patent number.
They can sell from £50 to something as crazy as £500 ! :) its all about how old and condition etc
According to bluebookofpianos.com, a Kohler and Campbell piano with this serial number would have been built in 1973.
How old is a Packard Piano serial # 134410
As of November 2013, the age of a Baldwin piano with serial number 246905 would be 32 years old.