No idea. But I just bought my first one at the summer FUN show. It's corroded VG, but the doubling is clear. I should have time to post a pic tomorrow. Do you have one?
Yes. It has something to do with the die, as opposed to the coin being stamped twice, I think. (Someone once explained this to me.) I'm editing this because I think the opposite is true. I think it is a repunched date, meaning the coin was punched twice, as opposed to the date being repunched on the die.
Okay, I posted this once before. I should have checked that thread before posting this one. Sorry. Here it is: http://cointalk.com/threads/1869-9-indian-head-cent.202654/
This is what Wikipedia says about it: http://en.wikipedia.org/wiki/Mint-made_errors#Overdate_.28OVD.29
It is a repunched date, meaning the date was hubbed twice into the working die... or at least I believe it was the working die, because if it were the master die that was double-hubbed more examples would exist. Rick Snow could probably tell you more about this RPD because if his knowledge in this series, specifically.
