Iron Blue Dun

Iron Blue Dun
Hook: Ray Bergman Nyack N.Y. SINFALTA brand "Red Label" size 14, courtesy of Catskill John Bonasera
Tail: Furnace hackle
Tag: Red floss
Body: Muskrat fur
Hackle: Furnace
Wings: Coot quill slips
There are many, many variations of this fly. Mallard is fine for the wings if you don't have Coot.