No, it's just a 305 dai- riki, it's a regular dry fly hook sized like a mustard 94840.
I had the fly angled so you can see the body. The body on an adult fly is pretty fat but I haven't found that it made much difference how you tie them. I think the big head is the trigger. Size 22 seems to be the sweet spot but I've tied them bigger and smaller. Works for me like nothing else and doesn't look like anything I've seen others tie although I'm sure others do well with different patterns. Thanks for the kind words.