I can’t tell with the top two. I would think the last chip is French ivory I believe that French Ivory is a mixture of plastic/celluloid and powdered ivory. I think I’ve seen French ivory with what looks like Schreger lines. Just an opinion as I’m not sure.

The last chip appears appears to also show schreger lines. If ivory I would think they would be in a circular pattern. All in all, hard to tell. Although I’ve had many opportunities, I’ve never collected those chips as I never thought they were ivory.

Then again, if they are ivory I wouldn’t be surprised.