1937, 3 Kop. - 40 Kop. "architecture of the modern Moscow", B = cut, set to 6 values, unused with original gumming and clean trace or rest of a hinge, signed Dr. P. Jem and stamp of the Soviet philatelist association as well current photo expertize Hovest VP (2018) : "in good condition, very nice and scarce stamps. ", Michel 3.200.- - hardly ever offered!