 The inscription "CT" beneath the symbolised Elector's Crown stands for "Chur Trier", now known as "Kurtrier" (Electorate of Trier).The route from "Coblenz" to "Franckfurt" lead through different territories, including the Electorate of Trier, the Principality of Nassau-Oranien, the Principality of Nassau-Usingen, the Electorate of Mainz and the Imperial City of Frankfurt and it was not uncommon for a territory to have its own system of length units.In order to avoid laborious conversions between the different systems, the down-to-earth dimension of "average distance covered by a fully loaded horse-drawn cart per" hour was introduced, which was much more useful to the common traveller of the day.