Keywords: Silver trowel commemorating the laying of the foundation stone of the Amsterdam city hall 28 October 1648 (front).jpg en Inscription 'With this trowel Jacob de Graeff 6 years old laid the foundation stone for the Amsterdam city hall 28 October 1648' nl Inscriptie 'Met deesen troffel heeft Jacob de Graeff oudt VI iaeren den eersten Steen van 't Amsterdams Stadt-huys geleght op den XXVIII Octob in 't iaer MDCXLVIII' http //libserv tudelft nl/tresor/books/Architectuur/Bouwkundige_Bijdragen/dvd3/mm0_0009/mm0_00e8 jpg Anonymous engraver trowel attributed to Johannes Lutma I 1849 publication PD-old Johannes Lutma I History of the Royal Palace of Amsterdam 1648 Bouwkundige Bijdragen Coats of arms of De Graeff family Jacob de Graeff Cornelis de Graeff Spades in crests Brick trowels |