20 Pf postmaster separation Seiffen, faultless corner margin block of four left above, centric cancellation "SEIFFEN (Erzgeb. ) 22. 8. 45. -9-10", certificate with photograph Ströh BPP: "genuine and immaculate - in perfect condition. " scarce block of four in outstandig quality for the large SBZ collection! Michel 6000,-