Siege of Groningen; emergency coin with portrait of Karl Rabenhaupt; diamond shaped emergency coin with rounded corners. Obverse: crowned coat of arms (large stamp) between value indication within an inscription. Reverse: bust of Rabenhaupt to the left; inside a circle; Groningen; Karl Rabenhaupt (baron von Sucha); anonymous; 1672; silver (metal); engraving; h 4.7 cm x w 4.7 cm x w 28.25 gr