1964 D Lincoln Memorial Cent Ufo?

I know they were enhancing the neckline to strengthen the design. But don't know if this was a hub issue or a die issue. If a die issue, then there would several others from that die that would have this. If there were an enhancement on the hub then there would be several dies that would show this. I've not seen that enhancement before. I've seen other examples:

It does look like engraving. So we will have to keep an eye out for more of these examples. In 1968 the design on this master hub had swell outwards so much that that the outer devices were touching the rim. So they created a new master hub in 1969:

Note the devices have moved away from the rim in 1969. But also note the bust sizes are different. The older master die had swollen that much over the years. New master hub, normal devices are back again. I would save this for a reference coin to see if more of these show up. (why would that be helpful?) Because the mintmarks are in different locations, if we find another one, with a different mintmark location, then we would know it is an alteration on the master hub. But if we find only other examples like your coin, they may have alter just one die. So save this and see what turns up in the future.

Maybe some more horizontal. I may save these as well. But the shot would have to be a bit wider.

This will do I think? What do you think?

Sorry Coop. About the best I can get.

Earlier it wouldn't let me post those two pictures.

Wasn't sure if I should start another post or use this same one.
Coin # 1 is original one from back in May.
Coin # 2 just found. It's not quite as nice of an example. Mint marks seem to line up. Both coins have same die scratches on obverse. Coin # 2 markers are faded. Same with the ( enhanced ) on neck and front of jacket.
Coin # 3 thought to throw it on here because of different neckline from coops examples.
Sorry if I should've started a new post and having so many pictures.
Sure would like your opinions. Thank you everyone. RobO

It could be from the same die? Try matching the mintmarks or other markers on the first coin, to see if it matches the other coin. (Hard for me to short out which image is which coin?)

On the date and mintmark area on the image above Obverse #3 image? That is what I need to have images of showing the full date and mintmark with each number to which coin is which. Then I could edit it from there. That way I can make side by sides to compare mintmark locations easier. With the full date it is easier to make the images all level. Then edit them to be the same height, then I can compare them side by side.
They are already there. So there are three different coins?

Looks like #1 and # 2 are the same die. #3 is a different die. Mintmarks slightly different.

Yes. Coin #1 is original posted coin. That is the first 4 pictures.
Coin #2 is resent find it's the second batch of 4 pictures.
Those two mint marks seem to match to me.
Now the #3 coin is there because it's neckline looks different from the ones you showed in that other group.

So coop if they match what is the conclusion?