Impossible to answer without more details. What is the intended use? What is your skill level? How much money do you have to spend? How old are you? Where do you live?
Best left to a gunsmith.
Best course of action is to take it to a gunsmith.
22-72
No published sn data that I am aware of. Best guess is 60-68
A .22 caliber Iver-Johnson Cadet revolver.
300-500
The value of an Iver Johnson Magnum 22 caliber revolver would be dependent upon a number of factors. Some of these factors would be the age and condition.
l Blue Book of Gun values
25-50 USD
50-500 usd
No such S&W model number.
About $150 if its in GREAT condition and has both the cylinders .22 and .22 magnum.