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Well it turns out that the ivory identifying sheets that I had were for Culluloid, Bakelite and other plastics. I picked up the below links so hope they help if they don't confuse.


Straight...

Since the pins do not have collars that could be a clue that they are ivory, however, with the beveled edge and the line around the bevel makes me think that it may not be ivory.
If you want you can...