1,50 Rbl. on 15 Kopeks Workers, handstamped overprint type III (swastika 6 mm), horizontal pair with left sheet margin, right stamp with inverted overprint, a so-called t?te-b?che pair, extremely rare, faultless mint never hinged condition, unsigned, photo certificate Walter Zirath BPP (2025) "These stamps are among the greatest rarities of the German occupation issues of World War II.", Mi. 14.000.- Only approx. four such pairs have become known to date!