Hello Da:

If you use Google Images to search for "Griffith's Gnat"
you will many photos that look a lot like your trimmed version.

But you can tell (just by looking at your photo) that you trimmed
the hackle before winding it. Trimmed hackles have thick,
square-ended fibers, rather than fibers that taper to a fine
point.

Thank you for you comments. I have to say I trimmed the hackle after
winding it up.