6 Pes. 25 C. on 5 Mark "Reichspost", block of four with the following types (from top left to bottom right): 19 I / IV + 19 I / III + 19 I / I and 19 I (IV, printing type I, mint, flawless condition, very rare multiple, examined by Georg Buehler and photo certificate Ronald F. Steuer BPP "very rare multiple ... in perfectly mint condition.", Michel 5. 550.- + +