This is a picture of a windup toy .... Joe Penner and his duck Goo-Goo.
Joe & Goo-Goo were a vaudeville act. His catchphrase was, "Ya wanna buy a duck?"
Joe would wander onto the stage, aloof, to the amazement of the MC. When the MC would ask Joe questions (Who are you, What are you doing here, What's with the duck, etc.), Joe would respond, "Ya wanna buy a duck?"