Luckily, Iver Johnson made mostly 8-shot revolvers. The 'Supershot 9' was made from 1929 - 1949, so figuring yours at the early range of that is reasonable. sales@countrygunsmith.net
Can't be answered without knowing who made it. Even then, there might not be data.
I also have one of these pistols. Have you had any responses off line to your inquiry?
depends on condition. no real value. maybe $75/$100 I've seen them sell for anywhere from $60 to $125 in average condition
its a raher cheap but somewhat reliable production model revolver either .22 (9shot) .32sw or .38sw 5 shot, they have basically no collectors value and in working condition worth anywhere from 50 to 150 depending on condition.
50-125 USD or so depending on specifics and which book you use.
Made in the US, used mostly in the US.