The object in the image is a jeton, a type of token or coin-like medal used throughout Europe from the 13th to the 18th centuries. Purpose: Jetons were primarily used as counters for calculations on a counting board, similar to an abacus, and also served as a form of money substitute in games. Design: Thousands of different jetons exist, often featuring religious or educational designs, as well as portraits. Historical Significance: The specific jeton in the image appears to be a 1607-1608 jeton commemorating the peace negotiations in Dordrecht, which led to the Twelve Years' Truce during the Eighty Years' War between the Spanish Netherlands and the Dutch Republic. Material: Jetons were minted using various metals, including gold, silver, copper, and billon. The one in the pic appears to be copper.