Russian Customs Seal 1876, Image & Found by HungryDuck.
Found in Russia.
Similar to other Russian Customs seals with the Russian double headed eagle displayed on one side and the orthodox cross on the other with a date beneath [1]876 but the partial name curved above this does not appear to be MOCKBA or the deminutive MOCKOB?
From Ged Dodd, "These are similar to those from Riga and St Petersburg and were used on a variety of goods. This is one from Warsaw.
Obverse:- a Russian Double Headed Eagle.
Reverse: - BAPШAB (WARSAW) 1876 around an Orthodox Christian Cross.
.... .see ref Tax 15 on The PeaceHavens Project, Russian State Arms Customs Tax Seals.