Action Comics #223 was distributed in Fall/Autumn 1956, with a published date of Dec 1956. The main story is entitled "The First Superman of Krypton", from a script by Edmond Hamilton, with Ka-El discovering that his father, realizing the destruction of Krypton was imminent, had experimented with a simulated yellow sun environment and had realized that Kryptonians would possess supreme power on Earth.

Sometime during the print run for #232 it was realized that the early copies were misnumbered as #233; this was then corrected and the rest were printed with the correct numbering. 

The error only seems to be on the cover of the comic: the interiors appear to be identical, including the indicia

CGC have sensibly separated the error copies as a variant of #223, in their census, with the copies numbered #233 categorized as "Misnumbered Variant" (one single 8.0 in the census around mid October 2016 and now mine which is a universal labe 1.5)

More info with pictures about this error in the link below.

https://recalledcomics.com/ActionComics223numbered233.php#:~:text=Sometime%20during%20the%20print%20run,printed%20with%20the%20correct%20numbering.

This is a super RARE once in a lifetime find for and Superman Action Comics collector.