Comic Book Anastatic Copy of FLASH DC Comicn. 123

The first comic where parallel realities were talked about for the first time was in 1961!

Today we know that there are many parallel realities that together form the substratum of the DC Multiverse.
But no one had any idea until September 1961. That's when Flash #123 came out, where the Scarlet Speedster ends up on Earth-2 for the first time!
Here, Barry Allen meets the hero he read about as a child: Jay Garrick!
The meeting between the Flashes of the two worlds is one of the most important stories in American comics, and is here re-proposed in an edition identical to the original.