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I cannot believe it was used for execution (decapitation?) purpose. Executioner swords all over the world had two-handed grips and the T-spine is counterproductive on a purely slashing sword. It would only impede a clean cut-through action of  decapitation.
 It also does not look like a Kirach.
 Strangely, it looks like a monstrous Khyber, but I have never seen Khybers with Tulwar handles and, especially, of these dimensions.
 The blade looks like Shams damascus. The handguard ends in a "tiger head" : Tippoo?
 What is it?