Completion of the locks in Katwijk; Silver Medal. Front: Neptune with trident in hand is sitting on its sea car that is being pulled by two horses in the direction of the river god Rhine; who sits with a pitcher and stuffed horn of abundance on the side between the reeds within an inscription; cut off: inscription. Reverse: locks in Katwijk; labeled; cut off: crowned coat of arms above date; Katwijk aan Zee; Uitwateringskanaal; Jean-Pierre Droz; Paris; 1807; silver (metal); striking (metalworking); d 4.7 cm x w 59.87 gr