[Jim McDougall]

Thanks very much JT, excellent references and well noted. I had missed your mention of the markings in the OP. I had no doubt of Osman's expertise which was well displayed in his entries, but took a devil's advocate approach based on what I know of India associated blades of this form.

It is interesting to see the profound influences this early Mamluk blade form had on European sabers such as Eastern Europe. The influence of Eastern European cavalry on other European armies, thus then to Great Britain by the transition of light dragoon regiments into the flamboyant hussars was of course profound. After the Napoleonic period, the further addition of lancers units followed suit.

So I am supposing that since this is an Ottoman blade, it could not have existed in India, and must have come from someplace else in the Ottoman Empire?
The reason I mentioned the notable duplication of these type blades in the Deccan was that that copying of the Ottoman style would suggest there must have been some presence of these in Mughal courts.

We know, as shown, that the period of 1790s was most innovative in England as LeMarchant sought to form regulation patterns for cavalry swords, which ultimately resulted in the M1796 light cavalry saber. If I recall from research, among the saber blades considered were those of the Indian tulwar.

It seems that apparently Solingen began producing blades of this 'Ottoman' style for British use for officers sabers prior to 1807.
These were used by cutlers, most notably Prosser, who mounted them on officers sabers in the expected variations in that period during the Napoleonic campaigns.

So getting back to this blade of your original post, the question remains, would this Ottoman blade have been mounted in India for a British cavalry officer? Which lancer units were in India.....obviously the 16th (Sikh wars, Aliwal), 5th, and the 21st (which were hussars at 1858 redesignated as lancers 1897).....the 17th in Lucknow. Did other cavalry officers adopt the mameluke hilt outside lancer regiments ?
With the elite hussar status and the administrative confusion of regimental amalgamations, it would be surprising if not.

Clearly this is not a civilian example, unless a diplomatic gift or presentation in which case, sometimes trophy or heirloom blades were used for their significance.

I am sure you have Robson (1975) and its revision (1996), but beyond that, the best resource for information of the kind you are seeking would be :Classic Arms & Militaria" magazine in England. The corpus of material on British sword patterns and history is pretty amazing, and reaching them for back issues, index or extracts would be best.