When Are Doubled Die Coins Not Struck Doubled Die?

I like where your going with that Dearborn. Big Kingdom man that was a mouth full but appreciated, just to clarify we are talking about a coin mirroring another exactly. Saying that let's run with what you were saying assuming it was a DDO that lets say stutter step now no one is arguing if it has Mechanical Doubling but the question I would have would that stutter step be enough to say devalue a true 1958 P Lincoln, honestly I can't say it would. The question then becomes where does it no longer have value as a DDO, so back to Dearborn. I think a DDO is just that, let me put it this way I have 3 coins in front of me the first is a true 1958 P showing all devices as a true DDO, beside it are 2 1958 P that are identical in every way but one and that is the devices are at different heights with the lesser being only a half the other my question is when does it fail to meet the standards of a DDO in this senecio?

BK- You took the words right out of my mouth prior to me reading this entire thread, and seeing your comment, about doubled dies. I was going to mention the same thing you did but you explained and worded it much better than I could have. Thanks!

What I've noticed is a true doubled die the altitude of both strikes is the same. On MD strikes the altitude is not the same. Check it out.