Souvenir sheets issue \"east European stamp exhibition OSTROPA in Koenigsberg\" in full original size, fresh light paper with two clean mounted special cancellations \"KOeNIGSBERG 27.6.35\" in extremely rare red endorsing ink, strikes in red endorsing ink comes from a private ink pad of a Member the exhibition management, photo expertize A. Schlegel BPP \". Postmark genuine. The quality is perfect\"