NZD1.00077STN002: a granite cannonball. In the late Medieval period the Nieuwebrug formed part of a defensive ring around Amsterdam, with a number of cannon mounted on the bridge. Dated: 1400 – 1700. Diameter 74.5 mm. Location: Nieuwebrug, Damrak. © Department of Monuments and Archaeology, municipality of Amsterdam, Harold Strak & Willem van Zoetendaal