10 kopeck brown & blue in combination with 1865, 1 kopeck and 1866/75, 3 kopeck with error 'background of 5 kopeck', tied by oval "S.P.B" to small piece. The 10 kopeck somewhat damaged at lower left and upper right corner (Probably adhering to previous substrate), otherwise very fine. The No. 1 was valid until 1881; this is the latest recorded usage of this stamp and a unique combination with the 5th and 6th issue. A great rarity. Certificate Mikulski (1999)
