The beads on the right look perfect for old Fichtegebirge (FB) products, likely of the ca. 1700-1840 period. The beads on the left are not as convincing and could either be more recent FB products or those of another furnace-wound bead industry, as mentioned in my previous note. One way to possibly determine their source would be to determine their chemical composition but that is a complicated and generally expensive proposition for quantitative results.