As a child I went to this dentist office not far from where I live now. Its still a dentist office though they have remodled it and I don't think you can see this sign anymore from inside. the best i can recall it is well over 30 years old.
It use to comfort me to look outside and look up in the tree and see this sign. No clue if it ever was part of the actual show but doesn't really matter. shouldn't we always try to find a smile in life???