The Matthiasgroschen, Matthier or Mattier is the name of various north German groschen coins of the 15th to 18th centuries.
Other states brought out numerous restrikes, which, however, were debased due to inferior alloying.
Due to the widespread use of the Matthiasgroschen, their name lasted for a long time, even when they no longer bore the image of the saint, similar to the Mariengroschen.
[1] Mattier embossings from the years 1624 and 1629 under Frederick Ulrich of Brunswick-Wolfenbüttel no longer show the image of the saint, but only its denomination EIN MATIER.
In addition, in 1675 John Frederick of Calenberg had a Mattier minted worth 4 pfennigs with a monogram on the obverse and its value on the reverse.