I've had this in the armoury for years, so long I can't even remember where I first saw it and can't find original dressing reference anywhere.
Assume it came from a magazine article and would love to credit originator.
Anyway a handy wet fly and, of course, I've a few variations
Hook: Partridge G3A Sproat #12
Thread: Semperfli black 8/0 Classic Waxed Thread
Tail: GP tippets
Body: Gold tinsel
Rib: 0.2mm gold wire
Hackle: Furnace Hen