Today I have received the shown sword from a German auction house and which was wrong described as "Moro klewang"!
It's a Nias sword with a seldom seen brass handle. When I returned from work we didn't have daylight anymore so here is the picture from the auction house. In hand it looks much better, the wood from the scabbard shows a glossy patina, the bands could be from aluminium but could be from mamas also, I am unsure for the moment. 57,5 cm inside scabbard, 55,5 cm without, blade alone 44 cm and 5 mm thick at the spine behind the handle. Blade is laminated and still very sharp.
Better pics will follow soon as I can take them.