On the earliest date for comics' Atomic Age, which falls between its Golden and Silver Ages

Caring about comic book continuity is crazy, but I was a hardcore fan for decades, so I know it's my kind of crazy. On one hand, I believe every writer in a shared universe creates a new alternate universe because any writer's version of a character has unique traits. Which means there are more comic book universes than there are comic book writers since many writers have written characters in