When I first glanced at this, I thought it said "WJM." So, naturally, I found myself asking "Say, wasn't that the Minneapolis station where Mary Richards and Lou Grant worked?"
As you can see, this 1962 promo is actually from a real station in Ohio. Not exactly a tidal wave of diversity rolling in off Lake Erie.
But speaking of WJM...I've wondered when watching a rerun of "The Mary Tyler Moore Show" what people who actually know something about producing a TV news show find most amusing about that depiction of the biz.