Erased Mint Mark On A 1967 Lincoln Memorial Cent?

I see it. I dont know what its from but I see the D.

From the pictures I would say a Grease Filled Die. I don't see any markings where it was filed off or otherwise removed. Just my opinion

U.S. coinage from 1965 to 1967 was not supposed to have mint marks.

Remember, there was a 'coin shortage' in the early 1960's, so mint marks were suspended for that time period in an effort to replenish the coin supply and prevent collecting by mint marks. Proof coins were also suspended in those three years, temporarily replaced with Special Mint Sets (and even the '65-'67 S.M.S. coins don't have mint marks!)

In that last picture, that really did look like the remains of a "D" mint mark to me. That would suggest that a 1967 Cent die was made with a "D" mint mark, and that it was simply ground off filled in (Edit: Good catch!) so that the die could be used. Who knows? Maybe the Mint had initially planned to restore mint marks in 1967 (and had made some early dies as such).

After all, the Mint did obviously plan to make a 1938-S Indian Head ("Buffalo") Nickel, because the "1938-S" dies became the "1938 D-over-S" dies that produced that variety of Nickel.

I'm no expert but that looks like a "D" to me. DNA is probably right; the original die probably had the D ground off, or I should say filled in, as the die would have had the mark punched into it (incuse). Really looking forward to the experts' views.

I'm no expert, but here is my guess. I don't think it is a mintmark. As stated by DNA there were no mintmarks on coins this year. And this wasn't the first year for no mintmarks. Also if a mintmark was on the die then ground off there would be damage to the field around the mintmark. Remember, the mintmark on a die is incuse or down into the die so it is raised on a coin. To remove it you would have to grind away the field around it.
Is this area raised? It appears to be in the photo. If it is then my best guess is die damage from a dropped letter. It is hard to tell from the close up but you have to look at the size of the mark and see if it matches the size of another letter on the coin. It could be the D in GOD but this looks too big. It could also be the loop portion of the R in TRUST or a portion of the R or B in LIBERTY. A previous coin had a dropped letter at this spot and it created this slight damage to the die.
Remember, this is just my guess. Let's see what the experts say.

It looks like a D but it doesn't look like a mint mark to me, it's slanted and looks too thick. Just my opinion, I hope I'm wrong. That would be a great discovery!

This would require an overlay with a 1964D and 1968D cent to see whether the mark indicated is the right size and thickness for a mintmark. I highly doubt it, but am open to possibilities.

After replying I remembered this is a 1967. Mintmarks weren't on the master hub back then. Were they part of the master dies or the working dies?