1 Sgr. Blue, gridded ground, on all sides having full margins and having bright colours horizontal pair in outstanding quality, right stamp with plate flaw II \"F shortened\" (field 129), clear cancelled \"Reetz 21 5\" (government Bez. Frankfurt/Oder), photo expertize Brettl BPP: \"faultless preservation. \" and expertise Voigt VP (2019) : \"the preservation is perfect. \"