I told the OP to email me photos and descriptions because often in a thread like this, people who have never seen an intact tusk say, "Oh, that is a XYZ....." or "You will go to jail...."
He does not have email or PM enabled, so I had to post for him to email me in the thread. There was nothing nefarious about it.
This same topic has been posted many times. There is considerable disagreement about the laws on pre-ban ivory, and I didn't want it to get into a major flap.
I have only seen two very small and low resolution cell phone photos of this tusk so far, but believe it is elephant, which makes it legal for him to own or sell as long as it was in the states before 1989.
As far as African elephant ivory is concerned, it is legal to own it in the US, as long as it was brought here prior to 1989. Transporting it and selling it within the US is also legal by Federal law. Some states, specifically Alaska, California, and New York have stricter state laws concerning ivory. Walrus has to be pre-1989 to be legal to buy or sell unless you are an Inuit, or it has been made into art work by an Inuit. Fossil walrus and mammoth are fully legal.
I greatly respect Mark's knowledge on walrus and Alaskan artifact items - he lives there and deals with his F&W guys regularly. The laws can seem confusing and/or contradictory when looking at federal vs state laws, and from state to state. Mark sells fossil ivory as a business, and must be very careful not to cross any lines in Alaska.
However, the ivory laws in Alaska are different than most of the rest of the US. I have researched this quite a bit, and talked directly to the F&W people in DC as well as VA and feel confident that I stay well within all applicable laws in the US and my state of VA.
What gets me most riled is the folks who say things like, "If you get caught that tusk you will go to jail." This is completely false unless you recently and illegally imported the tusk, stole it from someone, or you live in a state where there are super strict laws banning all ivory, especially concerning sales. Alabama and VA are not in that group.
My last comment is:
The most important protection in these situations is paperwork. You need good provenance on all ivory you own and use for making knives. Equally important is knowledge and understand of the Federal laws and those of the state you live in, as well as any state where you plan to transport or sell ivory.