59FIFTY Jackie Robinson Day 2024 Brooklyn Dodgers Blue A memorial cap commemorating Jackie Robinson Day. Jackie Robinson Day is an annual event held to commemorate April 15, 1947, when Jackie Robinson made his Major League debut as the first African American player. Since 2009, on this day, all Major League players, coaches, and umpires wear the number "42" during games. The silhouette is the 59FIFTY, a representative style of New Era. The classic silhouette is resistant to deformation thanks to a unique core inside the front panel. Released in May 2024. Size: 7. I purchased this from the New Era official website, but I'm selling it because the size doesn't fit, as I've only worn it a few times indoors. The brim is curved. Please purchase only if you understand this.