This study is concerned with twenty-one ancient clay impressions and one ancient clay cast which have been found in the excavations of the Athenian Agora. The twenty-one impressions and the lost impression in which the ancient cast was made were taken from Greek, and principally Athenian, metalwork of the 5th and 4th centuries B.C. It is clear from the contexts that several impressions were taken from metal objects which had only just been completed. The impressions and the cast functioned as workshop records and as models for craftsmen and customers.