The Ed Story Crackleback is lots different than the Taneycomo ones I ran across 20 years ago tied with iridescent color and flash. Eds version from his pattern book, 1991 edition, used different materials. And, later in life, he changed from flyrite 41 olive dubbing to turkey shorts or something. His newsletters always carried the pattern in them.
The Crackle back has been modified many times. It started as a dry wooly that could be floated, wetted and used as a wet fly, or drifted wet and weighted as a nymph. It was a multi-use pattern.
I used the Crackleback style with reversed palmered saddle hackles over a body of yellow micro chenille and a 2 stripe of peacock herl as a go to panfish fly for gills. I could grease it and use it dry. Worked well. Smallies would take to it from time to time also.