1 Thaler - Frederick William

Nassau's Thaler coinage of this period exists because the duchy found itself in an awkward geopolitical position — formally reorganized under French suzerainty as part of the Confederation of the Rhine in 1806, then scrambling to realign with the victorious allied powers after Napoleon's collapse. Frederick William's administration issued these Thalers across a window that straddles the final Napoleonic campaigns and their immediate aftermath, which explains the compressed date range. The dual Isenbeck references reflect documented die varieties between the 1813 and later strikes, not separate denominations.