Above: These were two sets of matching walrus tusks. They were "fresh" tusks, as opposed to fossilized, and are very closely regulated. Each tusk has a metal Federal registration tag attached at the base. All of these were about 24" long.
Below: Fossilized walrus tusk.
Below: Kind of a poor picture because it's pieced together from separate photos. It's one of my busier murals, with a village in the background
Another "fresh" tusk with tag.