Siege of Amsterdam; emergency coin of twenty pennies; minted from the silver of the Nieuwe Kerk; one-sided; diamond shaped emergency coin with beveled corners. Front: three stamps one above the other; from bottom to top: mintmaster sign: fire steel; city coat of arms: crowned coat of arms; year above two letters X. Reverse: blank; Amsterdam; anonymous; 1578 - 1631; silver (metal); striking (metalworking); h 4 cm x w 3.9 cm x w 13.47 gr