Spot or plain?

The Billiard Player. January, 1921

A marker noticed during a game that the two gentlemen at the table were bald, except that one had a small patch of hair. During the game another gentleman came to the door and said to the marker: “Will you please tell the gentleman with the bald head that I wish to speak to him?” The marker, in the irreverent way that some markers have, replied: “Which one, sir, spot or plain?”