10 Ducats - Aureus Magnus Helvetia

The "Aureus Magnus Helvetia" issues of the 1950s occupy an awkward category in numismatics — they are neither official Swiss coinage nor straightforward medals, but privately produced fantasy pieces struck by West German private minting firms targeting the collector and bullion gift market that expanded rapidly in the postwar economic recovery. Switzerland's name and imagery were frequently borrowed by such issues precisely because Swiss monetary credibility was at a peak during the period, when the franc remained one of the few fully convertible Western currencies.

No issuing authority, no legal tender status, no central bank backing.