Köln, Historisches Institut der Universität zu Köln
The collection currently holds c. 1,150 coins, mainly of the Roman Imperial period (Republic 72, Principate 517, Late Antiquity 104), plus a number of Provincial issues of the Roman period (93), and some Celtic, Germanic, and other Greek coins. In 2008, 22 Late Roman coins and 285 Byzantine ones of the Krengel collection were purchased.