Heinrich Köhler 383rd Auction – Day 5 Germany 1849–2000 – German Empire, German Colonies with Occupation Issues (G.R.I. and MAFIA), Plebiscite Areas, Germany after WWII – The Erik B. Nagel Collection (part III)

Interior service stamp 30 Groschen dark grey-blue in margin block of four, mint never hinged with slightly production-related gum bends, in perfect condition, unsigned with certificate Jäschke-L. BPP (2022)