Jamie and Uwe, thanks so much! There it was all along, in Dubin #124 (#106 old edition). Jamie indicated he does believe this is Dutch made, as contrasted to the great majority of what are commercially called "Dutch Dogons," and now fixed in Dubin. Joyce says "wound and paddled." And the Dubin timeline puts it right at 1700. This would jibe with the slave-trade use in St. Eustatius. The question remaining, then, is WHY the heck was this particular bead used to pay or reward slaves, and only on this small island. A collector / researcher on the island notes that the round / oval so-called Dutch Dogon beads are almost never found there, while the five-sided are ubiquitous, and their tradition well known and documented. See this link for background:

https://lifeonthegoldenrock.wordpress.com/2014/01/08/the-blue-bead-another-story-of-slavery/