German offical postal service Ostland, postal stamps of the German Reich President of the Reich Hindenburg, Michel number 512, 513, 519 and 522, on correct franked registered cover to Stuttgart, registration label with single line cancel "Pleskau" and official seal of the post office Pleskau, cancelled "PCKOB * K * 21 5 42, photo expertize Robert Brunel VP (2025) "the condition is perfect