Emergency coin of three pennies of siege of Groningen; emergency coin struck to pay for those who helped to fortify the fortifications; one-sided emergency coin with a hole in it. Obverse: double-headed eagle below letter G above coat of arms between years; under the left eagle's head a star; under the right head a ring. Reverse: blank; Groningen; anonymous; 1594; brass (alloy); striking (metalworking); d 2.4 cm x w 4.41 gr