Hi kai,
No, unfortunately I haven't been able to photograph any cuts from dugong ivory. I have however, recently for the first time seen dugong teeth in person and to my great surprise they are solid with almost no central cavity - not hollow as I thought a lot of available photos seem to show.
This has somewhat altered my opinion of what can - and can't be - cut from dugong teeth. I have taken photos of the teeth
in situ and will upload them when I have a chance to dig them out of my archive at work.
Regarding the ID based on laminations alone, I agree a 110% with you kai, that it's not a sufficient character alone.
Detlef, until I have actually seen dugong ivory in some cut sections, my best guess would be that the hilt you show is carved from hippo incisor. It fits the concentric layers with the central dot as well as the general outline - see standard reference picture attached. If they exported the tusk to SEA , then surely it wouldn't be too far fetched to assume, that the incisors went the same route?
- beautiful hilt btw!
All the best, - Thor