"The Weißpfennig (literally white penny; latin - denarius albus) was a form of silver groschen of the late middle ages. It was also known as an albus or a Rhenish groschen (rheinischer Groschen). It was minted from the second half of the 14th century onwards in the Lower Rhine by the four Rhenish electors of the Holy Roman Empire, who set up a joint mint in 1385-86. It was intended for everyday use, whilst the gold Rhenish guilder of the same era was intended as a trade coin. Those minted in Mainz were inscribed on one side ´Mainzer Rad´ and were also known as Raderalbus." - (en.wikipedia.org 06.10.2019)
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