I just called. It is legit.
I spoke with a gentleman named Kevin. He says he has had it for several years. He said a cruise ship out of the Bahamas had it and used it for firing salutes on-board. The bore is 2.25", and he said the OD at the breech is 10-11". He believes it is turned steel, not cast iron. The carriage is made to look naval, but there are no wheels now. It is actually set and attached on a dolly with casters.
He is located 3-4 miles off I-95 not too far from the Jax airport.
I can not drop $1500 on anything right now. I just bought a boat. But I might help broker a deal and grab it if one of you are interested.
He is FIRM on the $1500 price, and has spoken with several people about it, including some reenactors. Most are distant though.
I have his direct email address now. PM me if interested.