2 M. Large indoor service with plate flaw I \"small horizontal line in the \'E\' from second \'United\' \", centric cancellation \"Gdansk 1 u 13.9.20\", faultless preservation, the plate flaw only on field 5 occurring, a - especially in cancelled preservation - very rare stamp, expertized pupils BPP and photo expertize Gruber BPP (2019) : \"the stamp is genuine and in perfect quality. \", Michel 3.500.-