The new Geodatabase of Early Imperial Countermarked Coins in the Rhine Area contains information first published in U. Werz 2009, Gegenstempel auf frühkaiserzeitlichen Aesprägungen im Rheingebiet - Grundlagen, Systematik, Typologie, with updates and more detailed information concerning chronology, the coins themselves, which the author has generously communicated to DARMC. The dataset can now be downloaded from our Data Availability page.