Bally Playboy Backglass Pencil Concept Art Set

This is a original pencil concept drawing set  that was used to design the Playboy Pinball Backglass.  Very few of these original drawings come up for sale as these are unique one of a kind sketches.   This about one half backglass size.     A very great iconic piece that would be the pride of any Playboy or early Bally pinball collector.  You are get all three.  I would prefer to sell this as a set, but inquire if you want only one sketch.