Thanks Phil and it's a matter of retention, the leather, being leather,
allows the knife's horn's to squeeze through and then the horns seat
into place at the end of the sheath, providing secure retention without
the need of a flap. The horns on this knife are wider than I would like
them to be, as I say, good for protection, tough for sheath making

The BM4x series knives have horns not quite as wide.
forgot to add, if you tried to make the handles go in the other direction
there wouldn't be much if any retention to be had, on this particular knife
you could possibly make a sheath to allow the handles to go in the other direction
since there isn't a Latch to interfere with their entry, on regular knives the latch
poses the problem, plus there is still the retention...
G2