Coin of twenty-one pennies of siege of Kampen; emergency currency minted to pay arrears to the garrison; unilateral diamond-shaped emergency currency with beveled corners. Front: seven stamps: coat of arms between value indication; top and bottom inscriptions. Reverse: blank; Kampen; anonymous; Jul-1578; silver (metal); striking (metalworking); h 4.6 cm x w 4.4 cm x w 14.36 gr