The oldest known piece stamped with the Maastricht hallmark is the so-called "arm of Saint Thomas", a 15th-century silver reliquary in the shape of an arm, now in the Treasury of the Basilica of Saint Servatius in Maastricht. Unfortunately, very little is left from this period. After the Siege of Maastricht (1579) the Spanish troops ransacked the city for three days and took anything made of gold or silver. Some silver chalices and monstrances from the 17th century have survived. With the arrival of the French revolutionary troops in 1794, the medieval trade system was discarded of and the guild of Saint Eligius dissolved.