6 Kreuzer

Frankfurt's six-kreuzer piece was issued during the city's final decade of meaningful monetary independence before Prussian annexation in 1866 effectively ended the Free City's autonomous coinage. The .333 fineness reflects the broader German small-denomination problem of the period — keeping fractional coins in circulation required reducing silver content low enough that melting them was pointless, yet high enough to satisfy the 1838 Dresden Convention's standards for the South German gulden currency union.

The FHI reference places this squarely in the Frankfurt Handelsinstitut cataloguing tradition, a detail that matters for attribution since Frankfurt issues of this era are frequently confused with contemporaneous Thurn und Taxis postal territory pieces struck at the same facility.