10 Pf steep overprint with additional overprint \"5 Pfg. \", without blue line, used TSINGTAU 29 / 5 00, expertized Köhler and binder, as well photo expertize Dr. Hartung: \"the stamp is in fresh colours with small restrictions in the perforation (2 blunt teeth at the bottom, left lower corner perforation thin) and otherwise without further defects. The type 4 comes just once in the sheet of 50 before! \"