6 Pes. 25 C. On 5 Mark \"Reichspost\", block of four with following types (from left above to at the bottom on the right) : 19 I / IV+19 I / III+19 I / I and 19 I (IV, overprint type I, mint never hinged, faultless condition, very scarce unit, expertized Georg Buehler and photo expertize Ronald F. Steuer BPP \"very scarce unit. In perfect mint never hinged condition. \", Michel 5.550.-+plus