Whatzit Friday has come and gone, leaving you hungry for answers. Larissa B. guessed that it might have something to do with X-ray protection or could be a tool for flattening. Ana agreed with her. Someone guessing off the blog thought it might be a hanging sign with the signage worn off or a base for hammering on.
Good guesses everyone, but not quite right. It is... drum roll please... a bed warmer! Made of soapstone and collected in Wisconsin around 1930, this object would be heated and placed under the sheets to warm them up on those cold Wisconsin nights. Brrr!
It has been pointed out to me that, in order to comment on this blog, you need to sign into a google account. I have corrected that, and now anyone can comment on this blog, google account or not. I apologize for that oversight; it has been rectified.