Bill, here is the 1941 TOPS reference, verbatim. No credit given:
"THE STUCK CARD TRICK
Have a card selected and returned to the deck and secretly get it to the top. Then state you will endeavor to name the card by concentration. As you place your free hand to face, apparently concentrating, secretly moisten thumb, then press thumb against forehead as you are in deep thought then place deck against forehead back of deck next to the head. Name several cards at random and in each case you are wrong. Then say, "I guess I am stuck on this one" and bring deck away from head and there's the selected card stuck face out to your forehead."