Thanks for the suggestions Marius and Detlef, I'll give those a try.
Steffen actually still has the other shamshir at his workshop. I wanted to call him anyway to ask him if he has gotten around to starting the repair of the hilt. And I have not forgotten your offer, if it still stands.
Actually I'm not yet really sure if I want this scabbard restored, I think in this case conservation would be enough for me.
Another question, how can you differentiate different hilt materials, i.e. ivory, walrus ivory or bone. Are there any reliable defining features, and can it be done from pictures alone?