My best guess is 015 on coppercoins, but yours is in better condition, and I can't make out the markers. Compare the images with your coin. There are also a few other class 6 DDOs listed there. 022 looks similar. 007 does too. Here is the link to 015.
http://www.coppercoins.com/lincoln/...ie_state=mds
Good luck!
http://www.coppercoins.com/lincoln/...ie_state=mds
Good luck!



























