That sounds about right I think.. They were quite pricey for their time.
My grandpa and his father worked for TWA, and they used Compacts on their airlines. He said his father, a pilot, ordered two compacts (the old green ones he has) through TWA at an employee discount.
My grandpa worked for the airforce as a plane mechanic, and later for TWA for the same thing, ordered a Gold Compact with power nozzle and everything from TWA.
He uses them every day! He is obsessed with them, as am I!
I have found them to be decently quiet. With side air diffuser they are kind of that plugged nose sound.
His older green one (literally the same green as the background on vintage forums), does not have an air diffuser on it, and its just a hole in the exhaust. You can practically dry your hair standing up with these things!
They are significantly louder (same for CXL tristars) without a filter or diffuser.
