The text concerns the production of coins in the Litzmannstadt Ghetto (a Jewish ghetto established in the Polish city of Łódź by the German Nazi authorities). In 2019, the author contacted Mordechai Brown, who participated in the production as a 14-year-old boy. The present article has been based on his personal account. In addition, the results of the XRF analyses of the Łódź Ghetto coins have been presented.