Louisville Slugger produced a line of Hillerich Bradsby HB bats between 1929-1970 I have a no60 Bob Dory signature USN bat who was Bob Dory?
USN stands for "United States Navy" Bob Dory although not a big
star was a player who joined the service, during WW2, and this
signature model bat was issued and used by the military in ball
games.