The N. D. Cass company of Athol, Massachusetts made toys from 1896 right through to the 1990s when their warehouse burned to the ground in 1996.
Here are some Casspinette pianos that I've found on Ebay recently.
This one failed to reach it's reserve price and didn't sell.
This one, which is far nicer, sold for US $35.75 (£19).
This one came with it's bench and sold for just US $26.
And finally this funky red and black one sold for only US $10.50
It seems that not much is known about these pianos and this company, so if you own one then I'd love to hear from you. Please leave a comment.