While I can't tell you anything about this particular model, I can relate my experience with a J.P. Sauer and Sohn .22 rimfire revolver, if that might be of any help.
It was my first handgun, purchased in 1971. It was a Colt SAA replica, had fixed sights, and a zinc alloy frame and cylinder with a steel barrel and cylinder liners. Made in West Germany. The condition in 1971 as I obtained it made me think that it had to be as much as 10 years old.
Your revolver seems in excellent condition, but it may also have been produced in the 1960s or 1970s.
A little research indicates that Hawes was the importer.
One of these in .44 magnum sold for $325.00 from an on-line company recently.