I'm with David.
The big one has all aluminum mounts with some copper. Yes those slabs are horn. And yes this is a late 20th century (1980s -1990s?) piece. I would be quite surprised if it had lamination.
The second one is the more valuable one since it is much older, perhaps by nearly a century. This one should have laminations in it.
I wish Federico's site was still up. It had all of this information on it.