1918, Germania "Poctza Polska", horizontal pair from the upper left sheet corner with overprint "Gen.-Gouv. Warschau" in Aniline color, the left stamp mint never hinged, the right unused, hinges in the margins, few flat perfs at bottom of no importance, a very rare multiple with only a few stamps known mint, certificate Mikulski (2009) and certificate Petriuk (2020)
