Flavio,
Very nice blade. It is hard to say whether the hard edge is differential tempering or an inserted edge (both are seen). Differential tempering is most commonly done by heating just the edge and the quenching, which results in this kind of uneven temper. I think that the very different harnesses (seem from the much lighter edge area) might be from lamination. Is there any trace at all of a welding seam along the line where the two meet?
About the scabbard: I suggest not gluing it, as this is the traditional way scabbards (faak) are made in Thailand. The halves are held together by bands, rather than by gluing. Often braided rattan is used, but you may be able to find an alternative (braided wire, for example).
Valjhun: Yep, "vineger" = aceto.
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