This is a label from a 100g can of Zyklon-B, the infamous pesticide used in the camp system to kill lice and people. The Deutsche Gesellschaft für Schädlingsbekämpfung mbH (Degesch) company had a patent on this material and licensed it’s manufacture to Tesch & Stabenow GmbH (Testa) and Heerdt-Linger (Heli). These two subsidiaries then sold this on to the German Army and the SS for use in barracks and camps. The product was used widely across Europe in the control of lice and other insect pests in barracks and housing. This particular label is for the 100g tin which makes it likely to not have been supplied to the KZ system.