German States - Frankfurt am Main, Free City, Kreuzer, 1773BN. 0.6350 g, Billon, 13.8mm. Observe: City View. In English, this city's name translate as 'Frankfurt on the Main'. A large early tribe in the area was the Franks and in German 'Furt' means a river crossing. Thus, in medieval times, 'Frankfurt' meant the Franks' river crossing. Reverse: Crowned eagle and value. VF+.