For sale here is a baseball signed by 13 members of the Washington Senators, who played during the late 1950s. I haven't been able to pinpoint an exact date, but I've narrowed it down to 1955-59. Take this ball for $105 shipped.
Signatures are:
Mickey Vernon
Chuck Stobbs
Herb Plews
Ed Yost
Ted Abernathy
Pedro Ramos
Art Schult
Rocky Bridges
Camilo Pascual
Ellis Clary
Joe Black
Lou Berberet
Julio Becquer