Languages change and as time goes often words become simplified and in this case the t was dropped because it is still pronounced the same. The same with Thaler and Taler the former survived in the English language.
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Verweis : apukingThe German states are complex and are a mess for this. During the same time sometimes one state had Kreuzer on a coin and the other state Kreutzer. Here an example same state both minted in 1813 but one is with and other without T https://en.numista.com/catalogue/pieces54452.htmlhttps://en.numista.com/catalogue/pieces35960.html nowadays in Germany we just say Kreuzer, Taler, 10 Pfennig...
I do not have a proper answer at this stage, but as a lot of Kreutzers have been minted in various Hungarian mints, it might be simply the carelessness of the Hungarian mintmaster in Brassow or Kremnica or somewhere in Transsylvania, or the Croatian guy in Zagreb, or the maestro in Bolzano...
These grammatical mistakes frequently offer lovely variations to our Austrian-Hungarian coinage.
The more wartime (whichever war it is) the more urgent the coin is, so less quality control takes place.