There was a great article on Allvintagecards which I will link below concerning the Berk Ross sets from 1951 and 1952. I'm more partial to the 1952 set myself as it encompasses just baseball, but the 1951 set is great as well. There is some speculation, at least according to the article, that the photographer that worked for Berk Ross, also worked for Bowman and that's the reason why a few cards share the same artwork. The most notable of the cards being the 1952 Berk Ross Mickey Mantle, and Mickey Mantle's issue in the 1951 set.
https://allvintagecards.com/berk-ross-cards/
The 52 set is fascinating, in my opinion. Some absolute star power in it. Mantle, Mays, Robinson, Williams and even DiMaggio. I was initially planning on building the set, after i acquired the Mantle, but then the other cards in the set started to shoot up in value, maybe somewhere down the line I'll pick up the project again. If I don't however, I'll be satisfied with just the Mick and Joe D. My Mantle, in question:
