50-100 USD or so
Depending upon model, year of manufacture and condition - as high as $450 for 999, as low as $100 in poor condtion.
'AR' prefix indicates 1977
22-72
Smith and Wesson Model 1
All of them have a sn.
S&w
1941
A .22 caliber Iver-Johnson Cadet revolver.
Impossible to answer without knowing who made it.
300-500
50-125
Best left to a gunsmith.
l Blue Book of Gun values