Marker and colored marker
I'm guessing that this was an unsold convention sketch. Mostly 'cuz it is marked $7- on the back in my handwriting. Considering the reasonably priced black and white "chip drawings" I was marketing at conventions at the time--I'd have passed up on this drawing myself! Now I like it way too much to part with it.
One of these says I'm going to write about the chip drawings in more depth. How many of you folks still have one or two of 'em?