Take a close look at the location of the REG. U.S. PAT. OFF. below the centerbrand, particularly the fact that this is the narrow variety. Seems to me that this bat was produced sometime in the first half of the 1960's, well after Jackie's playing career had ended. Correct me if I am wrong, but I think the 1950's REG. U.S. PAT. OFF. began between the O and U of Louisville and ended below the K in KY.

Kevin