The 1855 German States Hesse-Cassel Thaler Silver KM 618.42 is a circulated coin made of 0.75 fineness silver. It was minted in Germany in 1855 during the German States period, specifically the Hesse-Cassel region. The coin is uncertified and carries the KM number 587. This historical piece of German currency reflects the craftsmanship and monetary systems of the time period.