10 Pfg small internal purposes of the service in the colour red carmine (from upper margin - there rest of hinge) with overprint error "overprint bar vertical divided and break through at from Gdansk), field 3, plate I, in perfect condition mint never hinged, not signed, certificate with photograph copy (for set from the stamp comes) Gruber BPP (2013) : "genuine and in perfect quality. ", Michel (without colour) only used with -.- values, other conditions even unquoted! Rare!