Bob Kane Batman

I was given this piece by Bob Kane in circa 1977ish. It was for my 15th(?) birthday. It is possible that I got it for my 13th or 14th I don't quite remember. In any event it is a really great piece done on white foam core in pencil and marker. This piece measures about 18" x 24" so it is really poster size. . I am unsure if it was ever published prior to Bob giving it to me or if he drew specifically for me. It was given to my father to give to me. My dad was good friend with Bob back in the day