I recently acquired an "old" set of poker chips that I am not sure what they are made of. They are quite hard (not clay)maybe bone or some related composite. Plan chip (no writing) red, white and blue. Wooden turn table holder with a very old looking "black" cover which seems to be made of cardboard w/black covering. Something like an old hat box. Anyone who can give me information as to how old this set may be or just any info. will be helpful. Please e-mail me with your reply.