Under High Magnification , I See Nothing Obviously Unusual 1923 Lincoln

I see nothing jump out at me like that.

Don't jump in with looking through a magnifier. Hold the coin and eyeball it first, tilting it back and forth in the light. If it looks strange, it probably is.

The second photo you posted on October 10 shows the full reverse. Notice the surface scratches running in two different directions. They run from NW-SE through ONE and from NNW-SSE through "AME" of AMERICA. This suggests cleaning. Seeing two different directions of surface scratches is a red flag.

Die polishing lines tend to be in one dominant direction. There are practical reasons for this. Remember, coining dies aren't large, vertical ram presses usually have multiple heads (two in the old days, four more recently), and the wire brushes used to polish the dies are much larger than the dies. Rocker presses have one die pair. The press operator generally must stand in just one or two locations to brush the dies, in order to work around obstructions caused by components of the press (the ram, the frame, and so on) and reach some of the dies. Press operators are under pressure to produce product, and aren't know for much patience with wire brushes. (I speak from experience here.) It's greasy, hot, dangerous work, especially on the older presses before safety locks and fail-safe shutoffs. Hand feed rocker/tilt presses were especially notorious for removing fingers. None of us want to have our hands anywhere below the die heads. We like our hands, and want to keep the pair of them. That's why two different directions on one coin should make us pause a bit.

Just some thoughts.

Lines on the reverse going in two different directions (like the coin was wiped).

The second set of photos shows it plainly.

Pete