Easy, its an Alexandra wet fly. Lots of slight variations of this one depending on location. Tied a lot of these for shops in BC in the 60's and 70's, named in honour of the Princess Alexandra.
Basic pattern
Typical sizes
6–10
Thread
Black 6/0 nylon
Tail
Red ibis, swan or goose wing feather (this one is blue and natural dunn)
Body
Yellow Dubbing (often tie it with a double tinsel body)
Wing
Six or more strands of peacock herl over red duck, swan or goose wing feather
Ribbing
Fine oval silver tinsel
Hackle
Black or brown tied wet
Head
Black thread