6+9 Pfg Vladimir Wolynsk unperforated in colour error blue, left lower corner of the sheet with plate flaw \"small s\" with full mounted cancellation of official seals \"the zone commissioner in Vladimir Wolynsk\" in impeccable, unique attractive exceptional preservation, photo certificates Krischke \". Perfect. Unique\" as well Zirath BPP \"it is a proof with an edition from probably only 1 sheet = 15 pieces\"