This bowl is like those used in KL Majdanek-Lublin inmates.
This has still intact the KL ownership stamping, which is Kgl. Waffen SS Lublin ( this is mean Krieggefangenenlager Waffen SS Lublin for beginning of KL Majdanek camp ) , as these were manufactured in some SS workshops there. Some like this one could be seen in Majdanek memorial museum in Lublin, being exhibited there.
SEE MUSEUM WEBSITE - YOU CAN SEE SOME SIMILAR BOWLS IN THE SLIDESHOW IN THE MUSEUM COLLECTION SECTION.