10 Rbl. on 1 Rbl dark blue, vertical pair with normal and inverted overprint (Tete-Beche), perfectly mint never hinged! unsigned! Certificate Zirath BPP (2025) "The condition is flawless .... These stamps are among the greatest rarities of the German occupation issues during World War II.", Michel -.-, for a single stamp with inverted overprint already 15. 000.-