Not being a specialist in these just quite keen on them, I think the the shark skin handle one is pretty certain 19th century. Some years ago I was in the Musee D'Homme Paris where many Dha weapons were labeled just as Indochina.
This could turn into a Dha fest. This one is pre ww2. Still a good piece of steel but the finish is not the same or is the colour and staining. Also it is thicker and heavier blade, the pointed tip has to some degree compromised the effect of cut from the distill end but it does have the ability to thrust. The older weapons shown here are flexible, the newer one is more or less rigid. The old ones do seem to be much finer steel and work which has given then some delicacy but all in better edged and handling weapons. The one with the ivory handle, the acute angle cut to the tip does give some thrust ability.
