The German blazon reads: In Silber ein durchgehendes rotes Kreuz, im ersten Winkel ein sechs-strahliger schwarzer Stern über liegendem schwarzen Halbmond.
The cross refers to the Electorate of Trier, and the charges in dexter chief (in the upper right from the armsbearer's point of view, but upper left from the viewer's) are court symbols that crop up often in the Rhenish region.