1952 is often thought of as Topps 1st baseball card set, but it was not.
Topps issued several smaller baseball card sets prior to their huge 1952 set.
The buzz word at Topps back then was "BIGGER is BETTER" for their 1952 Topps set which Topps described as: "GIANT IN BOTH SIZE and NUMBER of CARDS" (407).

Key card in the 1952 Topps set is #311 MICKEY MANTLE. Often called Mickey Mantle's Rookie card - BUT IT IS NOT. That honor goes to his 1951 Bowman.
1952 Topps "High Numbers" (#311-#407), are very, very scarce with an interesting story:
This HUGE set was released in series, released weeks apart. By the last series, baseball was over and football starting.
??? Perhaps the set was too huge ???
Shops had cards left from earlier in the year so many orders were cancelled, thus the scarcity.

Adding interest is how Topps got rid of the now useless cards, including THOUSANDS of MICKEY MANTLE's. They dumped them into the Ocean !!!

No only did the 1954 Topps issue feature the rookie cards of some of the greatest baseball players of all-time, it also was the 1st appearance of Ted Williams on a Topps card. Topps was so proud of this they made Ted the FIRST (#1) and LAST (#250) card in the set.

1954 Topps was released in three different series, (#1-50), a tougher mid-series (#51-75), and finally (#76-250). Of note for fans of variations, first series cards were issued in Canada with gray backs.

ROOKIE cards of future Hall of Famers Hank Aaron, Al Kaline & Ernie Banks along with cards of SuperStars Ted Williams, Willie Mays, Duke Snider, Yogi Berra, Whitey Ford, Jackie Robinson and tons more !!!