My grandfather, who died in the early 1990s, was a life-long poker player from Texas. When he died, he left me this set of poker chips and it has been gathering dust on a shelf ever since. I have done a little homework and the chips (there are 200 in total) appear to be ivory. Might anyone here be able to tell me anything more about them? Any idea what era they might be from? I recall him telling me that they were his father's. TIA.