I have an original 8 knuckle U.S. fighting knife in excellent condition excerpt that it has no sheath. I want to sell it but have a problem. My research tells me that it is very rare but I can't find anywhere where one actually sold so I can get some idea what it is worth. I saw one listed on Gun Broker with a case and drew a bid of about 750 dollars but did not meet the reserve. I would like to get additional info about this knife, especially what it might be worth. Thanks in advance for any help.