1, 50 Rbl. on 15 Kopecks workers, hand stamp overprint in type III (HZ 6 mm), horizontal pair from left side margin, the right stamp point at a inverted overprint on, a so-called tete-beche pair (tete-beche), extremely rare, in perfect mint never hinged condition, unsigned, photo expertize Walter Zirath BPP (2025) "these stamps belong to the largest rarities of the German occupation issues in the II. world war. ", Michel 14.000.- there are so far only approximate four pairs of this kind are known!