They appear to be Bakelite or Catalin chips, probably from the 30s, 40s, or 50s.
You can always find them on
eBay, because they were once produced in huge quantities, but are no longer in demand.
They contain some toxins as well, which are unlikely to be released unless you melt or grind them down.
Some of them are more marbled or translucent than others.
I kind of like the looks of them, and have posted here a few times that maybe they could become popular again someday, but few seem to agree…
I suppose you might be able to flip them for a small profit on
eBay but it could take a long time, and be nothing to write home about. I don’t see these moving much on
eBay.
The wood cases look pretty nice.