Ketchuping on late posts from last night:
DR Dear Lurker Iris, and BK, awakened some more nice memories of Westworld.  I had forgotten there was an Old World there, which is absolutely crazy because I probably ate at that one many times.  That, and the one on the Sunset Strip, and -- it seems like there was at least one other.  Beverly Hills?  I know where the Strip one was, but I need help on where the Westwood and any others were located.
And what was the "signature" burger there?  I always had it.  The one with diced onions and spices and herbs and whatnot mixed into the ground beef.  I'm sure I enjoyed many other things there, too, but  --  
THE SWINGER PATTY!!  

EDIT:  Answering my own question, the B.H. one was at 216 N. Beverly Drive.  Oh, this is interesting.  Bon Appetit, which I loved going to on lunch hours, was at 316, and Nate-n-Al's is at 416.  Don't you love old telephone directories??  But 216 puts Old World into the first block north of Wilshire, and I'm not remembering its appearance there.  Hmmmm...