3 Argenteus - Aureus Magnus Marathon

The X# prefix places this squarely outside official Bundesbank coinage — it's a fantasy or private medallion issue, cataloged in Krause's Unusual World Coins rather than the standard national series. "Magnus Marathon" suggests a commemorative tied to athletic achievement, almost certainly referencing the 1960 Rome Olympics, where Germany fielded a unified team under the awkward political compromise that kept both East and West competing under a single flag for the last time until 1964.

The "3 Argenteus" denomination is purely notional — no such unit circulated in the Federal Republic.