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)

1911, Longji Provisional Kaiserjacht 20 Pfennig vertically bisected, left half with cancellation "LONGJI 19.5 11" on letter with adjacent official seal to Berlin. The envelope with diagonal crease at bottom, otherwise in perfect condition, signed Müller-Mark and certificate R. Steuer BPP (1996)