Interesting Block Of Steel

[chips and more]

Over the weekend I found this block of steel. It was all stuck together with old grease and some surface rust, so it did look like a block of steel. Got home and was amazed at what I had found! Looks like some kind of apprentice machinist project? And the tool marks tell me it was done on a shaper. All the pieces fit perfectly and slide with no problems. Somebody did an excellent job making this thing. Anybody know what it is?

[4GSR]

I wonder if that was a school project for running the shaper? Advance course in operating the shaper?