Hello, so I recieved a katana from my grandfather after he passed away although was aware of the blade beforehand, I can't quite remember if it was given to him by a family member or friend of the family after the war i had sent pictures to a store or collector in Japan in 2016 however they may not have neccessarily been high quality enough for him to really identfy it only that it appeared to be a real sword dating 300-400 years back it appears to be unsigned or the tang is too rusty to really see it im not neccessarily looking to sell it as it has become a bit of a family treasure if only i could get more information about it or pointed in the right direction for authenticating it and learning about its history if possible, i know it is not a factory made blade and am fairly certain it is not a can carbon paper and a pencil or anything like that be taken to the tang to see if a signature arises from it or would it be better just to wait til i can get it to a professional? There is unfortunately a chip at the tip but i was informed it does not appear so bad as to cause to much concern for restoring it if there are any other specific images anyone would like feel free to ask