Modern illustration of the silver trowel with which Cornelis de Graeff laid the foundation stone for the new town hall of Amsterdam on 28 October 1648. The representation shows both the front of the trowel. On the reverse side of the sheet is a depiction of the reverse of the trowel and of the four gold medals made on this occasion. The trowel is attributed to Johannes Lutma and is in the collection of the Royal Antiquarian Society (BK-KOG-1494). , The silver trowel with which the first stone of the new Amsterdam town hall was laid on 28 October 1648 Silver trowel, with which the young Sir Cornelis de Graeff laid the first stone on 28 October 1648, Reverse of the silver trowel, One of the four gold medals, honoured on 28 October 1648 in memory of the four sons and nephews of the then reigning mayors of the city of Amsterdam , print maker: anonymous, Johannes Lutma (1584-1669), (attributed to), Netherlands, 1850 - 1924, paper, h 343 mm × w 240 mm