Silver, diameter 20.4mm. 3.33 gram.  DORESTΛD SIBBE COPIE Laureate head right.  R. + DORESTΛTVS around sailing ship.  GVF, almost as struck.  Clearly marked COPIE.
The design copies the silver denier of Louis I, son of Charlemagne (814-840) minted in the Frisian town of Dorestad.