My mother bought this at an auction close to 30 years ago for my collection. I have never worn it it has stayed packed in my jewelry box. The appraisal is probably from the 50's or 60's. This is only a guess from the backing and tape. Mr. Clifford is world renown and information on him can be found online. I have no reason to believe this artifact is not genuine and true. Made of BIRD leg BONE. Someone in the past before it was given to me restrung the NECKLACE on poly line not sinew. Sold as is with no returns.