1 Sgr. Black on pale rose, on all sides having full margins and having bright colours outstanding quality from right margin of sheet (2 1/2 mm), clear cancelled by official seal \"PR. Post EXPED REHDEN crown posthorn\" cancel (government Bez. Marienwerder), very rare as stamp killer occurring, expertized Grobe and photo expertize Brettl International Association for Philatelie Experts (2012) : \"In finest, perfect condition. Very scarce devaluation type. \" and expertise Voigt VP (2019) : \"the condition is perfect. As cancellation on stamp very rare, only a few examples known. \"