Beads are 6-11mm diameter. From the 18th to 19th Century. The term "Trade Beads" typically applies to beads made predominately in Venice and Bohemia and other European countries from the late 1400s through to the early 1900s and traded in Africa and the Americas. Many of these beads have been attributed to being made in Germany, France and the Netherlands as well. The heyday of this "trade" period was from the mid 1800s through the early 1900s when millions of these beads were produced and traded in Africa. The Venetians dominated this market and produced the majority of the beads sold during this time. The J.F. Sick and Co, based in Germany and Holland was one of the largest bead brokers/importers during this period. Moses Lewin Levin was a bead importer/exporter who operated out of London from 1830 to 1913.