Well, considering the rarity of the '99 Wide AM, I would have to assume that the number of Wide AM's with a DDO would be lower, therefore even more rare. So, as long as there was still interest, the price would increase for said double error coin. Right?
How about a coin with a doubled die reverse and obverse, die chips & breaks, off-centered, and minted on the wrong coin size planchet. That would make for a really ugly, messed up coin that would be worth a whole lot.
Maybe and maybe not. Difficult to tell about error coin markets. Usually an error coin is as valuable as it's popularity. For example a 1922 Plain Lincoln Cent or the 1955 Double Die. There are probably many similar coins but people have made these like super coins so the value is way up there. Everyone wants them. If you check out sights like https://www.coppercoins.com you would see there are probably Double Die coins from almost every year yet no one seams to care about them. If a coin had multiple errors on it and it was not popular, it's value would possibly be just average. Another example is the Red Book. Note in the 2008 edition, pages 390 and up, there are many error coins listed but nothing about multiple errors.
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