Hello all, I got this silver streak last year from a friend-- It didnt hold pressure, tried to do repair and failed shipped out to Baker repair in PA. The thing is awesome now-- completes my 3 calibers from Benjamin sheridan.
Sorry about your Dad. Happy that you and he at least shared some interests.
That's probably a sixties model Blue Streak. Mine has the same rear sight. Those won't stress-crack the barrel away from the tube like the ones on the later models. Some of the scope mounts will do the same thing.
You'll find a number on the left side of the receiver below the loading port. It's the year of manufacture in reverse. The letter following that gives you the month.