Uncle Bill,
Under Texas law, which is all I'm licensed to practice, or pretend to understand, this knife, like everything in the HI inventory except for the kagas katne, would be illegal to carry "on or about the person" purely because of its size, possibly also because of its blade design (Bowie) and also possibly because of the guard (knuckles). It would be perfectly OK to own it or ship it here though.
California law seems to be less tolerant:
"CALIFORNIA CODES PENAL CODE SECTION 12020. (a) Any person in this state who does any of the following is punishable by imprisonment in a county jail not exceeding one year or in the state prison: (1) Manufactures or causes to be manufactured, imports into the state, keeps for sale, or offers or exposes for sale, or who gives, lends, or possesses ...any metal knuckles...7) As used in this section, "metal knuckles" means any device or instrument made wholly or partially of metal which is worn for purposes of offense or defense in or on the hand and which either protects the wearer's hand while striking a blow or increases the force of impact from the blow or injury to the individual receiving the blow. The metal contained in the device may help support the hand or fist, provide a shield to protect it, or consist of projections or studs which would contact the individual receiving a blow. " Last time a question of California weapons law came up, Jim March spoke up and also suggested consulting James Mattis, who is a California knife dealer. Perhaps one or both will see this and comment.
Berk