Nail head, meet Hammer. Succinct and spot on. Those who have read The Twilight Zone Companion will remember that the only reason Rod Serling was able to get somewhat controversial morality plays on the air, was that he was able to "disguise" them as sci-fi and fantasy stories (e.g. racism...
Mine is definitely the 50's and early 60's. I have almost nothing in my collection from the 70's, and only a handful of 80's, 90's, and 00's. I absolutely love the westerns and cop/PI shows from the 50's, 60's (The Rifleman, Wyatt Earp, Maverick, Cheyenne, Gunsmoke, Wanted Dead or Alive, Lawman...