The idea here is simple and appealing: skip the hip entirely and carry a folding knife flat across the small of the back, where it sits out of the way until needed. The maker built a brown leather sheath to do exactly that, mounted on a wide leather belt with the knife lying horizontally.
The construction reads as a careful, traditional sequence. The pattern started as rigid cardstock, drafted with a mechanical pencil and a green circle template, then trimmed with a hobby craft knife on a gridded cutting mat. Shapes were traced onto thick vegetable-tanned leather with a metal awl, and a welt was glued between the layers with leather cement and flattened with a hand roller. Stitch lines came off a wing divider, holes were bored with a rotary tool on a vertical drill press stand, and the seam was saddle-stitched by hand with white waxed thread in a wooden stitching pony before being hammered flat on a granite slab.
The finishing details stand out to me. The pocket was wet-molded around the folding lockback with wooden scales and brass bolsters using a bone folder, two oblong belt slots were punched with a punch iron and nylon mallet, and the edges were sanded, dyed with liquid edge dye on a wool dauber, and burnished with an edge slicker.
The one open question, in my view, is the carry position itself. The finished piece was tested outdoors on grass for retention and draw, but a hard object riding over the spine seems like a genuine concern in a fall, and I would want that weighed against the comfort of the placement.