2006-P question

[aballein]

ok, i found a 2006-P i believe to be a DDO. The only problem is i cant seem to be able to attribute it. It has a die crack on the reverse running up column 3 from the planter, i can see just the slightest die crack running up abes forehead, looks like some thickness in his hair, and the date/liberty look to be shifted west. I have a hard time distinguishing east from west because i dont know which "hub" is the primary and which the secondary. All the pics i take dont really show what im actually seeing in hand so they are worthless. On a totally unrelated note....can a coin have "shelf doubling" on the obv and rev at the same?

[Dick]

Aaron, I beliseve it can happen, not often, but, yes, it is possible, and would have to be "laterally displaced "in the same direction, and degree of displacement, on each face. Experts???
Dick

[Bob P]

Aaron,
A couple of things. First, your terminology concerning east or west because you don't know what 'hub' is primary or secondary, is a little off. These doubled dies are made by only one hub which tends to 'snap' back into place after hubbing pressure is being applied.
Second...Your description of the doubled die is a familiar one. I have examined many of these that show the extra thickness and the elongation of the date. I have determined that a couple of them were too minor to list. Yours may be one of these, or it could be another one that I haven't seen yet. Give it a try as far as posting a pic. Since I know what you are referring to, I can tell sometimes...even with a not so perfect photo.
Third...Dick is absolutely correct in that coins can have 'shelf' or mechanical doubling on both sides at the same time It does happen infrequently, but it does happen.