I would guess machine doubline.... Machine doubline is more flat...where real doubline is rounded and looks better....try to find a good photo of the 1955/1955 cent....the date shows it the best but the doubling is rounded and looks cool! Keep looking and I'm sure you will find a great error yet! Speedy
Thanks Speedy, this was in a sealed mint set I got today... and for sure im always looking for that Great Find.. cho cho Merry Christmas Everyone!!
Best image I know of is on coinfacts.com. The use a pict of a 1955 DD for the wheaties section....here's the link http://www.coinfacts.com/small_cents/cents_lincoln_wheat_reverse.html
I have a better one in a book but I don't think its online too....wish I could have taken a photo of some of the one at the show this year... Speedy