Indi, The stitching along the top and bottom edges of the front "chevron" are purely decorative. (They would be in the way of the blade if they went all the way through!) The stitiches that hold the sheath together are spaced at 8 stitches to the inch and are made with very strong waxed linen thread. As the leather is so tough and each layer is 4.5mm thick I did not think the stitches would ever pull through, especially as the sheath has 6 layers of the leather at the mouth and 3 layers down the blade. The sheath was not really made for much practical use as the knife has been replaced with another that I am happier to risk losing or damaging out in the field.
As with most of my sheaths, all the layers were glued prior to being drilled and stitched.
With more practical sheaths I will often stitch at a count of 5 or 6 to the inch, and have been known to stitch at about 2 to the inch on a big machete sheath I made many years ago. I "stitched" that one with string and used a "lace it up" method as opposed to a true stitch. It looks in keeping with the whole thing and has lasted well so far.
No problem with you asking the question though. If we don't ask, we never know.