OP's drum is quite simply a Student Model snare. Nothing Radio King about it. Rapid strainer, single flange hoops with clips and no tone control.
Oh dear. You are correct. Nothing at all remotely slightly eentsy-teensy "Radio King" about that snare!
Consider me a fool, a philistine, nay, a barbarian for having referred to it as such. I am reminded of the time a young churl referred to my dear mother's beloved AMC Pacer station wagon as a "Nash." Why, I could have just died.
Now I am dying to know: how were you able to tell it was from after they stopped marketing a snare drum with the same feature set you just listed as the "Student Model Radio King?"
Being a "fan" of the "Slinger" product myself I simply must know your secret....was it the interior? An expert such as you would not just be taking his word that it's a '64. Or even a "Niles." Please share. I know my breath shall remain bated until you do so!