Original WWII German envelope (cover) for an Army Postal Service (Feldpost) letter. No letter inside, nice ink stamps and Feldpost stamp. Appears to be addressed to feldpost number 22260 (Ausbildungsstelle West Marine-Gasschutz- u. Nebelschule) from feldpost number 01099 (Marine-Gruppenkommando West Oberquartiermeisterstab).