Here is picture of that fly and here is what I wrote a couple years ago when I tied about 120 of Dick Brown's flies in his book:
"Locations are everywhere.. one of the famous used flys and is done in various colors. This is the original color.... Hook- 2 or 4.... this is on a 4.....Thread - Pink flat wax nylon.... Eyes- Medium bead chain, lead for fast sink..... Tail- Pearl Mylar tubing frayed..... Body- Pearl diamond braid..... Wing- Yellow krystal flash over blond craft fur. I am sure Polar fiber works as a good substitute. A lot more details in Brown's book about this fly and it is designed by Jim McVay."