Are These 1998 D Cents Examples Of Struck Through Grease?

Thanks Scooby Due. I've always wondered what happened to make coins look like that. And I do see quite a few of them up here, varying degrees of weakness areas. The two coins I showed, same year and mint, looks like they came from the same die, struck further apart, as one is more weakness.

Does the grease eventually wear away over the striking of several coins, to explain less/more weakness?

Would that mean that more metal is forced into the obverse image then? (heavier Lincoln's jacket) The metal has to go somewhere, right?

I thought it looked a little different than grease, but similar. I thought maybe weird wear/PMD of some sort.

I'm all excited because I think I'm getting to "knows stuff" about LMC's and am also learning to play with my scanner to take images from different angles to get different persepectives. The scanner light reflects one direction, so just shifting the coin to different angles then the lights hit from different directions ... which is VERY cool for picking up on die cracks and other details.

I chose to play with this 1998 D, which I've been doing for a while today, both obverse and reverse. I also have been spending a lot of time in that awesome Trails and Wavy Steps site, which is what got me to focus on this coin. It's a real learning experience and is exciting as there is a LOT going on with this coin! I swear the dies used must have really had a workout as I'm seeing lots of die cracks and trails and things. Too bad my coin isn't perfect shape, but its very circulated. Its a great coin to practice with though.

Here's a glimpse of the seated figure. I hope it loads large enough to see! Some angles of shots of the figure make me kind of blush though. I'm sure some of you understand though I had a different angle and its even more impressive. My mind is silly right now. Punchy.