Hi again, this one I is a bit of a mystery to me?? I was told the handle was made out of elephant bone?? Did sum test and seems to be true. But this knife has no markings either? At least that I've seen. Was wondering what kinda knife would this be called it's a folding knife in it's 10' inch long has patina so was wondering possibly a year if at all possible?? Blade also is 4.5' inches long & very sharp.https://photos.app.goo.gl/c2Gggdho9toJyDFy5Thanks