1943-P LWC 1-DO-011?

You may be right Lawest. I think it is thicker than normal though. There's not much wear on this coin.

I don't think it's an error. Very nice example of a '43 LWC though! Here's the stock photo from NGC.



Hmm, actually now that I compare them both I think your right. What about 14-O-I-CCW?

I agree. It looks like a normal coin:



Note the difference on the CC date image:
http://www.coppercoins.com/lincoln/...ie_state=lds
I don't see the class 6 doubling on your coin.

Side by sides are a great help. To compare with what is normal or with another known doubled die or RPM when they are so close in locations. Great care must be used to size/make horizontal/check to see if both images line up with the same devices on both images. (when a coin is taken at an angle, this can make the image of some devices to be longer/shorter because the pixel/image size is not correct) The way to check on a RPM is to make sure the images are the same width, place them side by side and see if the date parts of the devices are lined up. You might need to adjust when they are not correct.
I use horizontal lines to line up the tops of the devices, then take lets say the inside loop of the 9 to make sure they line up. After I get the date straight, then work on mint mark location on side by sides.
Then check to see of the shape of the mint marks are the same.
The location is often something that confirms for a RPM, but if the shape is a different type N-S-E-W, tilted, rotated, splits at different angles ETC) then it is not a die match.
(Some RPMs do change shape, get stronger/weaker with die wear and polishings)