Hello Séverin,
I am surprised that nobody comment until now!
A very nice Hemola you get there!
Any signs that the blade is laminated? Was the seller able to tell you more about this sword?
I doubt that someone would be able to distinguish between swords from Savu and Roti, I think that there are not enough examples with clear provenance useful for comparison. But frankly said I don't know if I am correct with my assumption.
Regards,
Detlef