7 Kop black-blue/dark violet-ultramarine, state arms 1884, imperforate example in perfect used condition, ultramarine underprint additionally shifted upper left, Hovest BPP photo certificate (2004). Experts Zbigniew Mikulski and Ludger Hovest state only three examples of this variety known, thus major rarity in perfect used condition, expertised Th. Lemaire, Mikulski AIEP (1995) and Hovest BPP (2004) photo certificates