Two shamanic Tonkin knives

[Sajen]

Have won this two little knives by a german auction house. Me was told by an expert in this field that this are shamanic knives from the Tonkin area in Vietnam. Maybe someone else will be able to confirm this.
Both knives has antler handles of an unknown deer. The smaller one has a spatula similar blade from iron and has a dark patina, I only have removed carefully active rust. The collar is from silver. The bigger one has a blade from low grade silver alloy or a other metal, I am unsure by this. The collar is from the same metal and very nice embossed and the blade has naga or dragon engravings. Both blades are not made for cutting so an use by shamanic rituals seems nearby. When I look at them I think that both has a good age.
I post this knives for your enjoy but would also be very interested to know more about them, special for the real use. And of course I am curious to see similar ones. Just every comment and all informations are very welcome.