In Africa these are sometimes used to imitate coral
The equatorial band on these beads identifies them a Prosser beads
The molded bead-making technique was invented by the button-making Prosser bothers in 1830's in Bohemia (now Czech Republic) and named after them.
Great quantities of Prosser beads were made for the African trade
I heard a few decades ago that the Prosser factory had been dismantled and moved to Morocco, which could explain why these beads don't show the same signs of wear that their antique cousins do.
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