It is quite certainly a traditional group of beads , used until the 19 th century in the Morbihan region , in french Brittany . It was worn during a period of nine days , for curing eye disease .
Same ensemble existed , in modern glass beads , four clear and one black , in the middle of 20 th century .
I bought it at a flea market , as it is , circa 2006 and it took me almost ten years to identify it .

ref. : Lionel Bonnemère and Gustave de Clomadeuc .

apparented to the theme of " gougad - patereu " in Morbihan , Brittany , France .