2011 D Jefferson Nickel Error?

machine or Mechanical Doubling, note that the "doubling" is shelflike and undefined. Common and interesting but no added value and technically not an error. Commonly sold as doubled dies by uninformed sellers.

and to CCF

The seller posted in jasper62 reply has already sold 7 coins exactly like this with MD as DD coins with prices ranging from $4.50 - $15.00. He has received positive feedback on them all. I guess if the buyers are uninformed...but happy with their purchase is what matters. I wonder if someone was to inform the seller of his mistake...would he pull the listings and offer refunds to the buyers.

Generalized question: How is it, that this does not qualify as an error? The coin is not formed as intended. Educate me please on who sets or is there, a real standard to doubling, as opposed to Clear double die, where the whole side of the coin is double stamped. DD is technically the whole side of the coin.

Here's my view of Doubled Die strikes as opposed to Machine Doubled strikes. I may be wrong, but here it goes.

Machine Doubling:

The coin is struck as intended, but then the die "bounces" and damages that image, leaving the coins with Machine Doubling. Hundreds of thousands (or more) coins may show Machine Doubling from a single production run. LOTS of these coins are incorrectly listed for sale as DDOs.

Doubled Die:

On a Doubled Die, the die has an image the was not what was intended (engraved more the once) and transfers a doubled image onto the coin. When the error is discovered, the die is pulled from production and any out-of-spec coins that can be located are destroyed. It just depends on how quickly the doubled image is found as to how many coins with DDO / DDR exist.

An example would be the 1969-S DDO. Less than 20 examples have been located, most likely because the error was found quickly. A 1969-S with Machine Doubling is very common because it was within specs, so nothing was done to stop the damage being caused by the slightly out of adjustment equipment. Hundred of thousands, if not millions were struck as the adjustments on the press varied. That's why it's so easy to find a 1969-S with MD.

A true Doubled Die can have an image that is Machine Doubled, too.

The chances of finding a real 1969-S DDO are almost nil, but I still have to look at every coin with that date and mint mark. The 1969-S with MD is common, but each time I find one it makes my heart beat a little faster. That's until I look closer at the details and see it's just another cent.