The Amazing Spider-Man #012 (1964)
“Unmasked by Doctor Octopus!”
Writer: Stan Lee
Artist: Steve Ditko
After Doctor Octopus escaping from their last battle, he tries to find Spider-Man which leads to him capturing Betty Brant. Spider-Man fights Doc Ock until he is defeated and unmasked to be Peter Parker. Everyone believes this to be false and Doc Ock escapes. Later, Spider-Man and Doc Ock fight in which Spider-Man wins.