I am pretty sure the sword comes from the mod JRC's Witcher Style Sword Pack, but unfortunately, there is no public SSE port for this mod. I have ported it for personal use but I think I f***ed up something because some swords are draker than what they are supposed to be (I don't know if it makes sense).
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https://www.nexusmods.com/skyrimspecialedition/mods/14132?tab=files
One question. What haiir mod you use?