Beautiful antique Venetian millefiori beads from the African trade. Jack DeWitt has done a most beautiful series of bead photos (many Picard collection beads) that he offers as bead photo blank cards with envelope.
I think I could make these by pressing indentations into rolled cane. "Antique Venetian seven layer chevron drawn cane bead collected from Africa. Sometimes these seven layer chevron beads are referred to as 'Trade Beads'.