edge of the oppidum may have served as fields. But during its heyday, the oppidum must also have depended on agricultural produce from surrounding areas. The main cultivated food plants were barley and spelt. Proso millet, einkorn, emmer, avena, wheat and rye were also grown. Lentils, vicia faba, poppy, hazelnut and various fruit were also consumed. An enormous amount of animal bones indicates intense husbandry; perhaps Manching also served as a supra-regional livestock mart. The position of the site near several streams and rivers always suggested that fish was part of the diet. In recent years, the intensive study of pit fills has proved this to be true. Even traces of the typical mediterranean fish sauce (garum) have been recovered. Economy Manching was the site of an extensive iron industry, which mainly produced goods for local use. The iron ore was extracted in the region. Products included a variety of specialised tools, clearly indicating a lively craft tradition. Manching was a centre of production for glass beads and bracelets, most of them of blue glass. There was also a developed production of pottery, jewellery and textiles. Finds like Baltic amber and Mediterranean wine amphorae show that Manching was part of trade networks spanning all of Europe. Further evidence is provided by luxury tableware (campana), bronze vessels and imported jewellery. Trade was facilitated by the fact that Manching had its own mint. A local system of coinage, including small silver coins (quinarii) and impure bronze ones served mainly internal trade. External trade relied on coins of gold and (from the early 1st century BC onwards) silver. Like much Celtic coinage, the gold coins minted at Manching are distinctively concave, even cup-shaped, (in German, such coins are traditionally known as Regenbogenschüsselchen or rainbow cups, a term derived from the belief that they are connected with the treasure to be found at the foot of a rainbow). False coinage, e.g. bronze coins with a thin gold covering, has also been found. Fine weighing scales were used to monitor the authenticity and value of coins. The large variety of keys and locks from the settlement is remarkable. They indicate that people had property worth protecting, and that the cohabitation of so many people in a small area made physical measures necessary to that effect. Different locks appear to have been used for gates, doors, or furniture. Secondary use of metal The "Altenfeld" excavation revealed