Vierke in his study of the Fichtelgebirge and Bohemian bead industries, Die Spur der Glasperlen, mentions that in the late 18th and early 19th centuries, until the introduction of extremely restrictive import restrictions in the 1820s, Russia was one of the main export destinations for beads from the Jizera Mountains (Bohemia) with Bohemian wagon trains transporting glassware and beads to Moscow. It is very likely that the Bavarian beadmakers – through agent in Hamburg or Amsterdam – likely did the same. Vierke notes that some of the beads may have made it from Moscow to Siberia and Alaska, but most were brought by British and American trade ships coming around Cape Horn.