3 Rbl on 60 K carmine, vertical tete-beche pair with inverted overprint on of the lower stamp and normal standing overprint on of the upper stamp, impeccable mint never hinged, photo expertize Zirath BPP (2018) \" . Have in each case an authentic overprint. These stamps appertain with to the largest rarities of the German occupation issues in the II. World war. \" Michel valued the tete-beche pairs with - ., already a single stamp with inverted overprint appraises 14.000.- Euro! There are very few pieces of this stamp with inverted overprint known!