Die Adjustment Strike

While it's in poor condition, it is a genuine weak (low-pressure) strike. Using the term "die adjustment strike" is always indefensible since, unless you were there when the coin was struck, it is impossible to determine the actual cause of the weak strike. However, numerous independent lines of evidence indicate that spontaneous press malfunction is responsible for the vast majority of these errors.

Yes because it has not had the pressure from the dies needed to make the planchet expand outward and press against the collar. One way to tell the difference between a heavy Grease Filled Die and a low pressure strike is that on a low pressure strike the rim will not be well formed and on dimes quarters etc the reeded edge will be poorly formed or missing. A heavy Grease Filled Die is actually a higher pressure strike and the rims and edge are typically sharp.

dbrablec,

that is not a low pressure strike but it is not roadkill either. Notice that your coin has a complete strong rim, something that will not be seen on a low pressure strike. A strong rim along with random device weakness points to an obstructed die, typically struck through a heavy layer of grease but on rare occasions it can be the result of a capped die. It is a shame your coin has so much staining, it would have been a nice example of a coin Struck Through Grease. Is the reverse affected at all?

I wonder if that stains like that can be removed and not harm the coin?