So, what is it called?
It has a stripped peacock quill body taking about 1/2 the hook, hackle and wings taking the rest. 2 mallard wings the same size as the body overall including the hackle section and of course a long black cock hackle.
I had to look at it closely so I tied it up from the image. Apologies for the light. Photographing anything in our house after dusk is appalling.
The proportions are consistent with what is in the book. I didn't just scan the book because of copyright of course (or Copy Wrong in this case

)
It's not what I know as a Black Gnat but it was on their Black Gnat page along with the dressing that I know for the proper Black Gnat.
Ever wish you could rename thread??