The Berluti knot traces back into European aristocracy.
Ian's secure knot neglects to tuck one of the loose ends - it's not as secure.
The Turquise Turtle Knot is described on page 357 and it is similar, but not the same as Berluti knot.
Is this just a failing of this knot or am I doing something wrong?
I don't remember how to tie the knot. Instead when I am in the middle of tying it I imagine which way the ears will come out and if it will not go the correct way I take the other direction (there is only two possible ways to tie it).