1941 D Walking Liberty Half

Not sure what is going on in the obverse right field. Is that glue or tape? Also appears to be an issue with the obverse rim at 1 O'Clock. The coin looks MS but may get a "details" grade.

1 O'clock is just an optical effect. The toning looks kind of weird, but may be just the lighting. It is weakly struck, like many other walkers of the era, but assuming no damage or artificial toning, this could easily merit a 65.

However, on the right field, we can see something that looks like a coffee stain. If so, the coin may still come back as details for being "stained"

1:00 rim thing is indeed an optical effect from the glare of the 2x2 mylar.
My desk lamp is right above it.
The coffee stain in the right field is just that, it' looks like coffee.
The rest of the toning is actually a cool red/orange that I could not capture on camera, but the toning looks really nice under 10x.

Yeah, the coffee thing is not part of the toning.
It looks like a whole separate thing.
If I drop this in Acetone will it affect the toning?

Thanks