Ostropa souvenir sheet on not correctly franked cover franked registered printed matter with special cancel "Königsberg 23. 6. 35", certificate with photograph Dr. Oechsner BPP (2011) : "the souvenir sheet in original size shows the as usual, on the acidic gumming leading back browning and is in good quality. The cover is opened and folded. ", Michel for lots 900.-