I bought one of the hats from Ebbets flannels. They used to be small company, but are now owned by Lids. (i was worried when they bought it but quality seems to still be ok. They just have some really weird non vintage designs now.
Ebbets Field Flannels sells a Penn State University Nittany Lions Vintage Ballcap. Made in the USA since 1988!
www.ebbets.com
According to their site, this is what the design is based on.
Description: Authentic reproduction of the original Penn State University 1963 ballcap. Hand-sewn in wool, this cap is built to last a lifetime. Product Details:
History: The 1950s were very productive for the Penn State Nittany Lions baseball team as they made the NCAA Tournament 6 times including a runner up finish in the 1957 College World Series. The 1955 squad finished at 17-5 and were led by hard hitting outfielder Rex Bradley. The current Nittany Lions play their home games at Medlar Field at Lubrano Park, University Park, PA.