Mount the hook and start the yellow waxed silk mid-shank; the wax darkens the silk to that olive Greenwell hue, so don't over-wax.
Catch in a length of fine gold wire at the mid-point, then wind the silk in tight touching turns back to just above the barb and forward again to build a slim, even body ending one eye-length short of the eye.
Spiral the gold wire forward over the body in 4-5 evenly spaced turns, rib in the opposite direction to the silk for durability, tie off and snip.
Strip and tie in a sparse coch-y-bonddu (furnace) hen hackle by the tip, then take 2 turns as a wet collar and stroke the fibres down and back to sweep along the body.
Cut a matched pair of slate starling wing slips, marry them dull sides together, and set them low over the body as a wing, tips reaching the bend.
Build a small neat head, whip finish and add a drop of varnish.
Other versions
2 more in the app: Classic Recipe (2), Gregg Dressing (1940).