Hello Godfried,
Seems you have been really busy in acquiring niece pieces - please keep them coming! José, can we get this new member off probation for improving the flow of communication here, please?
Most certainly this blade is laminated - as pretty much all (traditionally forged) Dayak blades are. In this case, it's a bit difficult to discern since different surface treatment as well as cleaning prior to etching and uneven staining may all contribute to the shades visible in the pics. How about the other side, Godfried?
Close-ups along the blade would be great and very likely help to get a better understanding.
The typical bladesmithing approach in Borneo seems to be to only fold the obtained mild steel upon itself, multiple times. Pretty much identical to what is done in Japan. Thus, there usually is no contrast between the layers and the layers tend to be quite thin resulting in an almost homogeneous appearance
Despite many people expecting pamor to be bold and contrasting, neither layers of contrast, nor complex pattern welding, nor actual etching/staining define a pamor blade. Any laminated blade can be argued to have pamor.
In this case, the blade seems to have been treated with arsenic (warangan) as would be typical for some keris. It will probably prove impossible to determine when and where this was done; the style of etching looks almost Balinese (with lesser prior surface finish though). One might be inclined to believe that this result is pretty unlikely to be achieved by the warangan commonly done in Java/Madura. Tougher to rule out someone in the Netherlands trying to improve the appearance - however, there don't seem to many examples like this. A tough riddle!
Regards,
Kai