The Miami Marlins, that is. This picture was taken in 1968 when Jim Palmer was working his way back from arm injuries that significantly limited his time with the Orioles in 1967 and 1968.
The Marlins were the Orioles' Class A minor league team in the Florida State League. Jim had played for the Marlins for part of the 1967 season (5 games), and returned for 2 games in 1968. It looks like Jim got to keep his #22 when he was down in the minors.