Yeah, I'm skipping ahead. I just found this one, and I can't wait to post it. Paul Sloane and George Blake will have to wait.
So for all intents and purposes, there wasn't a single Harvey Dent appearance in the Silver Age of comics. He essentially bypassed the entire era until the birth of the Bronze Age, where Denny O'Neill brought him back.
However, an impostor Two-Face DOES make one single Silver Age appearance. The twist here is that the impostor isn't just another crook trying to frame Harvey or take up the mantle! So who... is... Two-Face?

Yeah, didn't see that one coming, did you? Wait'll you see the actual story itself!
( An oddball Silver Age gem from 1968's Worlds Finest Comics #173! )
So for all intents and purposes, there wasn't a single Harvey Dent appearance in the Silver Age of comics. He essentially bypassed the entire era until the birth of the Bronze Age, where Denny O'Neill brought him back.
However, an impostor Two-Face DOES make one single Silver Age appearance. The twist here is that the impostor isn't just another crook trying to frame Harvey or take up the mantle! So who... is... Two-Face?

Yeah, didn't see that one coming, did you? Wait'll you see the actual story itself!
( An oddball Silver Age gem from 1968's Worlds Finest Comics #173! )
