Found this...

[OCD]

Is this 89 D doubled or am I seeing things? If it is what kind is it and is it worth anything?

[Steven]

Had to look around but I knew I had a photo of about the same MDD.
Strike/mechanical doubling damage.

[Brad]

It is Machine Doubling...throw it back.

[Wheat Cents]

Read quite a bit in the CONECA Forum about Strike Doubling . Quite a bit of going back and forth between factions. Some seems to love 'em depending on the degree.

I have never really "collected" them except when I find one like this ....

http://www.lincolncentresource.net/forums/showthread.php?p=5266#post5266

then ... I keep it...

[THE PENNY MAN]

That is what you call a LEAVE IT RITE....leave it rite where you found it.