Willie Mays baseball cards are some of the most collected in the hobby.

The Say Hey Kid easily ranks on anyone's list as one of Major League Baseball's all time greatest--if not the greatest.

Harry Jupiter of the San Francisco Chronicle once said:

"No record book reflects this kind of concentration, determination, perseverance or ability. As a player, Willie Mays could never be captured by mere statistics."

He is one of the most beloved baseball players in the history of the sport making Willie Mays baseball cards some of the most collectible in the hobby.

Listed here are 27 of Mays' most important baseball cards that you can filter by the various methods shown below.

Sandy Koufax baseball cards are some of the most sought after of any pitcher in baseball.

Once known as "The Left Arm of God", Koufax was arguably the greatest lefty the game has ever seen.

His career started slowly as he struggled with his command for much of his first six seasons.

Then, in 1961, he got things under control and put together a string of six of the most dominant years a pitcher has ever produced.

During that stretch he compiled a jaw-dropping three pitching triple crowns, four no-hitters and one perfect game.

For his achievements, Koufax became the youngest player ever inducted into the Baseball Hall of Fame at just 36 years old.

Listed here are 13 of Koufax's most important baseball cards in the collecting hobby.