It's probably impossible to ID who did the scrimshaw, unless someone sees your inquiry and steps forward if they recognise that particular artwork,.... or,... if you can find some signature initials (in, or, close to the scrim) which
might help with your search for an individual artist (if he/she has a reputation for doing such work).
Any idea who the previous owner is/was?
Any possible way to contact them, and ask some questions?
They're beautiful horns,.... and I like the spout (I've never seen one exactly like that before).