Detlef,
Thanks for posting these nice reference pictures.
Soemba is Sumba AFAIK. But having been there myself I am quite positive that your knife isn't made in Sumba.
To me it looks like a Siraui. It's only the hilt that is slightly non-text book. Why do you doubt it when holding it in your hands?
Mine (variation #1) is 31 cm out of sheath, also has a horn hilt and is quite heavy.
Michael
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