Quoted from MattElder:Normal size backbox and normal width playfield, just shorter, and dual leg mounting holes. It's what Alvin G & Co. referred to as their Mini-Pin.
It's actually a fun little game with an interesting story. More on Punchy later when I'm not typing on this phone....
Getting back to Punchy here....
The inspiration for the game came from Michael Gottlieb's 4 year old niece, Danielle, when she drew a pinball playfield with a clown face on it. She called it the "Clowny game". Michael and Jim Shird took the idea and designed the game using only existing parts (aside from items with artwork, obviously) to eat up leftover stock. So, owners of other Alvin G games may recognize certain wall type ball guides that were pieced together, Switch-Flippers (minus the actuator wires), and other things tossed in there.
Another little piece of Punchy trivia is that even though there were only 103 units made, there were 2 different cabinet versions. Some came with the start button on the left and the ticket dispenser on the upper right, and others had the start button on the right and the ticket dispenser on the lower right.
Anyway, I think it's a great little game. Good luck on a sale or trade, OP!