Here is a previously struck Lincoln cent that was overstruck by Bolivian dies. This created a unique error that is both dual country and a double denomination.
Dated 1991, this Lincoln cent was overstruck 17 years later by 2008 Bolivian 10 centavos dies! This error likely occurred when the Lincoln cent was tossed into a bin containing Bolivian 10 centavos planchets.
The original underlying design of the Lincoln cent on both the obverse and reverse are present.
The Lincoln cent obverse was overstruck by the Bolivian reverse die. President Lincoln's portrait is clearly seen as are the numerals 1991 and all letters of LIBERTY and IGWT.
The Lincoln cent reverse was over struck by the Bolivian obverse die. The Lincoln memorial building and letters of U.S.A, ONE CENT and E PLURBIS UNUM are clearly seen. Even the mint engravers initials for the reverse design, FG, Frank Gasparro, are present at the base of the memorial building.
A normal Lincoln cent and a normal 10 centavos share identical diameters of 19 mm.