Mock .020 store display engine.

Hello Cox experts. I need some help identifying this engine. I read or saw some info on an engine like this a long time ago. I’m almost certain it was a mock engine for hobby shop displays. Wether just as an engine display, or in a plane etc, I am not sure. It has an uncut cylinder with no piston. The crank is also uncut, with no connecting rod pin, just a solid cylindrical block. It spins when prop is turned.  If anyone can enlighten me I sure would appreciate it.

Closer look

That's an interesting piece. Uncut cylinders can occasionally be found as supposedly they were sold to people to built custom performance engines. A good number of the unfinished parts were likely leaked from the factory over the years with engineers and executives bringing parts home, etc. Within the past decade or so, a few parts lots have appeared on eBay that were full of R&D unfinished or prototype parts.