The 1956 catalog shows 3 models. The top of the line included "an especially designed" scope.

By 1969 they were using the term "Super Sport" for some models. That catalog also lists the Beretta W.XXII model.

Here is a thread on Rimfire Central:
http://www.rimfirecentral.com/forums/showthread.php?t=430982&highlight=supersport

Pete