Rare Dayak Daggers - Sadop and Dohong

[asomotif]

There was an interesting discussion on the swap forum on dohongs.

at a certain moment there was a claim that dohongs were pure ritual weapons, as there are no pictures of dayak fighting with dohongs.
But also other claims have been made :

quote-
The Dohong was most likely the traditional sword/knife before the mandau.
So most Dohongs are from before 1850 and there are not many in museum collections.-unquote

But previous in this same thread nov 9th 2006 :

quote-
[I]There are some drawings that show s Dajaks with blowgun and parang-ilang but never see one with Dohun or daggers that is in my opinion not so old on Borneo as the sword the dajaks Used
The daggers have Arabic moslim influence .[I]-unquote

so we have the opinion that the dohongs were there before the mandaus...
And than the opinion that the dohongs are not as old as dajak swords...
(strange enough by the same person)

I am hardly an expert and mostly atracted by form of waepons.
But what could / would be the thruth on dohongs / sadaps ?

Does anybody have pictures/drawings of these waepons being used at all ?