Is it possible that a coin has been affected by doubling on both sides of the coin and mint mark? I thought that doubling would just happen to one side on a few attributes and that it couldn't be on both sides. The reason I ask is because I found this on a 1999P nickel and I have never heard of a double die from that year and I find doubling from time to time on nickels but never on both sides, so I was wondering if this was possible?
Yes, it is possible to have a doubled die on both the obverse and reverse. You have to remember that each obverse and reverse die is made separately, and they can be swapped out so that one die can be paired with any number of other dies. With that said, we would have to see photos to determine if what you have is a true doubled die and not just machine doubling. Chris
Since the 1999 coin had the mint mark on the master die, it should not be doubled as well, so my opinion is that it is a machine doubled coin. What Chris says above is true for pre-1990 issue as the mint mark was applied to the working dies individually. Jim
actually Jim, you have that backwards. on a post 1990 coin the mintmark is on the master die and therefor when making the working die it could be doubled along with everything else on the coin. pre 1990 if the mintmark is doubled in the same direction as other details then it would be machine doubling. Richard
But Richard, didn't the single squeeze hubbing process start in Denver in 1996? I know there are still DDO discovered and recognized after this, but I don't recall any on the edge of the coin, only in the center. If my references are correct there was only one hubbing of the nickel working die in 1999. Jim
yes, it is highly unlikely that this would occur on a 1999 coin but I was trying to clarify about comments regarding pre and post 1990 coins. Richard
