Jeez.....didn't think I had something that hard to ID. Looking at the possibilities mentioned, they do all look similiar. The guy that gave it to said it was a piece of flooring he helped install....which is a use of the possibles.
Mark....no, I wouldn't call it greasy. I put it on the belt sander to clean it up and show the grain. Fairly smooth, but can't say it's greasy or waxy feeling.
Mystery goes on......