Ron, it is a Daiichi 1640, I have been using them for my spiders mainly, but I rather like them for all wet flies.

Cholcomb, it is a rather home designed version, I did not have any suitable hen hackle for the version on the site, so I rather made do with what I had.
The wing is starling, or any other suitable feather, the body is yellow rabbit lightly dubbed on primrose silk, the tail is dun hen fibres.