Actually if I recall looking into Elgood (1994) there was no mention of Bukharen work in Oman, but he did mention such Central Asian (Bukharan) work in Yemen, as was also pointed out by Ibrahiim. It seems Yemen had far more variations of influential sword mounting and furbishing which include the impressive examples of Hadhramaut, I believe considered part of Yemen. Also in San'aa which I believe as well part of Yemen in kind there were impressive swords mounted.
Again trying to keep to the suggestion of Maghrebi, most likely Algerian provenance for this blade, and likely these mounts, as Algerian, other examples of deeply stamped marks have been found in earlier discussions on a pistol.
As earlier noted these deep stamps may be those of an outfitter rather than a formally recognized arsenal. These places mounted received trade blades for distribution, and similar deeply stamped marks seem to occur in similar blade location near the ricasso in many cases (except obviously the pistol which is on the top of the barrel over the lock, not sure of proper term).
There was I believe a Yemeni classified sword of silverwork mounts with a straight backsword blade again with similar stamp (and location) but with central blade markings of Italian form (three hourglass type stamps).
As well noted by A&A, enameling was practiced throughout Ottoman Empire and the presence and skills of artisans from Central Asian regions and perhaps others would have certainly altered regional characteristics.
Without specific and reliable provenance we would have to turn to the styles, motif and theme of features in hopes of better classification.
Overall, most elements direct to probable Algerian mounting of this remarkable sabre.
Charles just wanted to thank you again for posting this, and giving us all what has become a great exercise in investigating this sword and others of its form.
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