5 Pfg. on 10 Pfg " China diagonal overprint " so-called 1st Tsingtau issue, vertical pair with Bdr put into the perforation down.Overprint "5 Pfg." by the mission printery Tsingtau in type 1, mint each with original gum and fold or traceses of gum flaws-, class defects (neglect), certificate Steuer BPP (2011): ".is genuine.. ... have original gum with hinge or trace of adhesion ... "Michel, 1.600.-beautiful show piece of the 1st Tsingtau issue and overprint moved with the one into the perforation as a unity surely not frequently existing!