 The tower was then rebuilt in Amsterdam Renaissance style in 1620, with an eight-sided top half and elegant open spire designed by Hendrick de Keyser, featuring a clockwork with four clockfaces and a carillon of bells.The name of the tower refers to the fact that the guard house on side of it was used to mint coins in the 17th Century.In the "Rampjaar" ("disastrous year") of 1672, when both England and France declared war on the Dutch Republic and French troops occupied much of the country, silver and gold could no longer be safely transported to Dordrecht and Enkhuizen (where coins were normally minted), so the guard house of the Munttoren was temporarily used to mint coin.