This c. 1950 US Royal Special is marked "Electronic" on one side of its equator and "New Caldwell Cover" on the other side. It has a unique square dimple type pattern that includes 4 interior angles.  It is in a plastic wrap of some type, that is mostly all there, but with some damage to it.  The ball might not be as old as the other balls in this auction, but it is neat and as mint as can be.