ferrydude, now that you bring that up you are correct. Hey, I'm getting old.
The Queen Air 60 had a square tail and the the 65 had the swept back tail, correct? Now I'm sure the pressurized Queen Air was designated the 88.
Aero Commander came out with a pressurized version of the 680 called the 620 Astro Cruiser about the same time. I actually flew one of those.
Sadly Aero Commander and Beechcraft used the same wing design from the piston powered aircraft when the they upgraded the aircraft to turbo-prop. The King Air 90 and 100 didn't have many problems, however, the Turbo Commander had wing problems from the very first. When the King Air 200 came out it also had serious wing problem.
Now both the King Air 200 and all of the Turbo Commanders have serious heavy duty ADs out for the wings.