1956-D rpm???

Found a 1956-D penny in a pile of wheat cents. To me it looks like there is another D above the original mint mark. I'm no expert but I looked up known rpms/omm or whatever and didn't really find one that matched this. I'm hoping someone knows what I have and can explain this to me thanks.

here are some pics at various angle

pic 1
http://i168.photobucket.com/albums/u186/sandrock86/coins/CIMG1131.jpg

pic 2
http://i168.photobucket.com/albums/u186/sandrock86/coins/CIMG1129.jpg

pic 3
http://i168.photobucket.com/albums/u186/sandrock86/coins/CIMG1123.jpg

 

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http://www.coppercoins.com/lincoln/diestate.php?date=1956&die_id=1956d1mm003&die_state=lds

How about this one?

 

looks good-- like the one that Abe found.

and an earlier die state.

 

Nice find!!

 

Very nice find!

 

wow thanks this would be my first error find other that filled dies lol ... if you consider those errors

thanks for the link abe i forgot about that site