Between 1973 and 1981. These were made by JP Sauer and Sons in Germany, and imported by Hawes.
50-250 USD or so
100-1000 depending on specifics
Depends on model and condition- you did not share that, and we do not have enough info to answer.
No known data.
Around $325-$350, depending on condition.
50-300 USD or so
Depends on what shape its in but $250-$300 is a good price if its decent.
Blue Book of Gun Values will get you in the ball park