The ad section included subscribers looking for autographs, scorecards, books, pictures, pennants but not too many cards since none had been issued since 1941. 1950s Topps, Bowman, and other Mickey Mantle baseball cards. ... true rookie card is the 1951 Bowman, the 1952 Topps card is considered by most baseball card collectors to ... Set builders planning on collecting th.e entire set of a particular issue of baseball cards often like to get that set started with an unopened box. t.he baseball cards that you can buy such as t.he rare a.nd vintage can be also found at flea markets a.nd also second hand goods shops. It had 72 pages with 3 punch holes. The High numbers are in print run number 4 and contain only 54 cards due to the omission of 6 numbers that were withdrawn. These cards were collectibles even during the time these players were actively playing the game and are even more valuable today. The secret to making it a profitable hobby is research and attending baseball card shows, as they are where you are going to find the best deals and meet the most knowledgeable experts.