Learning To Grade Walking Liberty Half Dollar

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The places to look for wear on Walkers is on the diameter.
On the obverse: along the line of Liberty's body and left leg,
on the reverse: along the slanting line of the eagle's body from the head to the bottom of the left leg.

These two diameters show up quite strongly on worn examples, because they are ridges of high points in the design.
Sometimes I have considered if these ridges are a design weakness in an otherwise superb example of neoclassic coin art.

Particularly look at the detail on Liberty's head, the eyebrow of the eagle, and the feather detail on the left leg of the eagle.

A lot more coins were produced per year for the war years.
It is reasonable to assume that wartime issues were more lightly struck to extend die life. The result is that it is common for feather detail to show up less sharply on MS grade coins.

Definitely a weak strike; characteristic of the 1941-S Walkers.
That of course makes it difficult to grade since you have to separate a weak strike from wear.
Certainly AU; whether it can make a low MS is problematic.

Not sure if these are hairlines or whatnot, but I see something going across the sun's ray closest to Lady Liberty.

As for grading, I would go AU details.

AU50

The optimal way to identify whizzing, for example, is to hold the coin at a 120 degree angle to the lens (with 90 degrees being when the coin is flat on a surface).

But even when the coin is held at this angle it probably will be necessary to position the light source at various angles to capture the presence of any fine hairlines...