Deciduous tusks of the woolly mammoth, Mammuthus primigenius (Blumenbach, 1799) are rare in the fossil record. In 2003 a left deciduous tusk was found in Flamschen near Coesfeld (Westfalen, Germany) on the slag-heap from a wet sandpit which is exploited by the firm Westquarz Tecklenborg GmbH. This article presents the find, the first one in Westfalen, which measures 6,4 cm in length. The autor has donated his finding in October 2018 to the LWL Museum für Naturkunde in Münster where it is shown in the permanent exhibition.