Dave, I on I or 1 on 1 is fairly common. The things to note with the obv 6 pennies is the R or B or V over A. Value wise I doubt if the overstrike would add anything to the overall value. Pete, I am not too sure of a I over I on the 1860 I asked because I was curious as the obv 6 is rare on the 1860 and any abnormalities would make the coin just that little bit more interesting.