The PSA Registry lists 491 cards in a 1952 Master set and 550 in a Super set. The additional cards involve hobby recognized variations front or back, and the Super set include the rare "Canadian" gray backs 131-180.
In 2013 Huggins and Scott auctioned what they called a Super set ay 579 cards. The additional cards were mostly recurring print defects. A check list of that set is in the link below. It includes a Rosen variant beyond the red and black backs, as the black back can be found with or without a pink slash around the cap. Jeff actually posted one of the pink slash versions above.
Here is Huggins and Scott link to Super checklist
https://r.search.yahoo.com/_ylt=AwrE...0ZuZgWXpfXjGo-