Not sure of it's origins, found it in the Bergman collection; different set of components than the Welsh fly of the same name.

hook - Dai Riki 075 #8
thread - Danville 6/0 black
tag - Uni-Stretch orange
tail - bronze mallard
rib - small wire gold
body - Uni-Stretch brown
hackle - furnace
wing - bronze mallard (folded)