Welcome to the friendly forum. If that truly has a 3 1/2" barrel (measured from the cylinder to muzzle), not a 4", it's a Model 43 or it's predecessor the '22/32 Kit Gun Airweight'. They are not marked Airweight but had aluminum alloy frame & cylinder. After 1957 re-named the Model 43. OTOH if it's 4" & steel frame & cylinder it's a 22/32 Kit Gun or it's predecessor re-named the Model 34 after 1957. At any rate either of these are fairly desirable to collectors. Yours was shipped between 1955-59.