Superman makes a puzzling appearance alongside his teenage self in this 9/55 DC Adventure Comics issue #216. If you want the answer to the front cover question "How can Superboy and Superman be together?" then you'll have to find another copy of this Gold Age issue, or do some research, as this example has just been encapsulated by CGC with a rating of (4.5, Off-White to White Pages). Contributing creators are Bill Finger story, Curt Swan cover, Curt Swan, Ramona Fradon, and George Papp art.
Opening Bid $100.