Atom#3(1962)

David Clinton is a former con who has become obsessed with clocks and has opened up a clock shop following his release from prison. Deciding to become a costumed criminal, Clinton adopts the guise of Chronos, and uses clock related weapons to steal exotic clocks. When he learns that Ivy University has an atomic clock when Ray Palmer visits his clock shop, he decides to steal it that night as Chronos. When he does so, he rouses Ray Palmer who tries to stop Chronos, however Chronos' weapons prove to be too much of a match for plain ordinary Ray Palmer. Changing into the Atom, Ray is unable to stop Chronos who not only manages to escape but begins to suspect the Atom's true identity. Figuring that the Atom may have deduced his as well, he devises a trap in anticipation of the Atom's appearance as his clock shop. Sure enough, after Ray Palmer notices an exaggerated bruise on Clinton's face the next day, he decides to pay him a visit that night as the Atom. He falls for Chronos' trap and is knocked out with gas and stored in a watch on Chronos' wrist while he goes back to steal the atomic clock knowing that Ray Palmer would not be there to stop him. However, the Atom takes advantage of the fact that Chronos has no idea the full extent of his powers, and shrinks small enough to escape the watch, get away and confront Chronos as Ray Palmer. Knocking out Chronos and calling the police, Ray then shrinks back down to size and gets back inside the watch, preserving his identity when the police arrive to capture him.