Hi This could be the transition after the Niabor to the other Iban mandau
or they picked up the old style to an newer blade
these type I call seadayak sword or mandau because they have no classification
An Niabor has an total different blade same as the langai tingang
It has an typicall Iban short type off hilt from an certain area.
( If you don t like the mandau anymore you have my email addres Arjan