The AMI Numismatic Collection is a reference resource for the study of the economic and monetary history of the Istrian peninsula. Now numbering over seven thousand specimens of money—paper notes and metal coins—the collection has grown out of archaeological investigation, donations, and purchases. As the collection continues to grow, so does its significance, both to academic study and as a museum collection.

Chronologically, the collection covers a broad span from pre-Roman to modern times. The oldest coins are from the Greco-Hellenistic and, to a lesser extent, the Celtic period. Roman coins are the most numerous and well represented, dating from the Republic to late antiquity and the collapse of the Empire. The collection also includes Byzantine, medieval, Venetian, and modern period coins

The work associated with this collection includes collecting specimens of, analysing, protecting, and presenting monetary issuance that circulated in Istria over the centuries. Special emphasis is placed on the context of finds, i.e., provenance, which opens the window to a more complete understanding of economic and political processes on the peninsula.

Čentur near Koper is among the most important sites, where a hoard of about 26,000 late antiquity period coins was found. Although most of the hoard has been dispersed, more than 2,000 specimens are kept in the Archaeological Museum of Istria. This is the largest known hoard of its kind in the region, important because it is a clear reflection of the complex social and economic circumstances of late antiquity. Analysis of this hoard provides valuable insights into the economic history of the northern Adriatic.