These are estimated to be from the 1700-1800's. It is hard to determine the age, so the condition of the bead and whether the bevel is rounded or faceted is used to make the determination.
Chevron Bead History Chevron beads have been made in Italy since around 1496. The 7-layer Chevron trade beads date back to between 1480 and 1580. After the 7-layer beads, 5-layers beads were made. The early 1600's saw the introduction of the 4-layer and the 6-layer Chevron trade beads whose outer layer was either green or black. Chevron trade beads were made for trade by Europeans in Africa. They were exchanged for different services, palm oil, ivory, other goods, and even slaves. Africans placed a lot of value on them and they were used for decoration, as a measure of value, as currency, and for various other uses.