Where in South East michigan can i get an apprasial on a Katana (samuri sword) that was used in WWII?

My grandfather brought this Katana back from WWII. I did get an appraisal done on this about 6 years ago. It was appraised for $2,000 it has pieces that date back to 1600's. And from what the appraiser said has the markings that it was from the part of japan that had the samurais revolt, if you remember the movie the last samurai where the samurai's fought with i guess they would be called the Imperial army and lost. This sword could was probably used to fight in that. I just wanted to get a 2nd appraisal and 2nd opinion from another appraiser. I do not want to sell it i have tried to take it up to Gibraltar when they have their gun and knife show. The problem with that no one will tell me what its worth but they all want to throw money at me to buy it on the spot. It means too much to me to sell i just want to make sure i have it insured for the proper amount. As stupid as this sounds i was watching hardcore pawn last week. Its about a pawn shop in detroit and a women brought in a katan she claimed was from WWII and wanted $5,000 they said they would have bought it and possibly at that price but hers was not a real sword it was not made out of the right material.