Also in 1948, Paige became the first Negro leagues player to pitch in a major league World Series. He retired in 1965 with the then-Kansas City Athletics - at the age of 59. https://en.wikipedia.org/wiki/Satchel_Paige
The most expensive baseball card in existence is the 1909-1911 T206 Honus Wagner card. In the late
1800s-early 1900s, baseball cards were largely manufactured by tobacco companies. Back then, cards did not feature the player’s stats. Rather, the backs usually had an advertisement - tobacco, candy, department stores (Boston Store came out with a set of cards in 1917), etc. Wagner, a Hall of Fame shortstop with the Pittsburgh Pirates, is said to have strongly objected to his likeness being affiliated with tobacco. As a result, his card was pulled from production, but not before a small number (50-200 estimated) made it to the public. Authentic copies can range anywhere from hundreds of thousands of dollars to nearly $3M, depending on condition.
Finally, for Brewers fans everywhere - long before the Milwaukee Brewers we have come to know and love, there was a minor league team also called the Milwaukee Brewers. That team existed from 1902-1952, and played in the then-American Association at Borchert Field on the city’s north side. https://en.wikipedia.org/wiki/Milwaukee_Brewers_(American_Association)