This is a neat variant of Lee Wulff’s original “Secret weapon” for Atlantic salmon. I’ve tied a few of the originals (well, not exactly the original as I didn’t use a molded plastic body) and had used a bent straight pin for the post with a yellow bead. I really like Davie’s use of the mono post here. If you have fished the Gaspe, you have likely seen this pattern or have had it recommended to you. Flyspoke has a great little article posted on the evolution of the pattern and a nice collection of images to accompany.