Not missing any clad. Looks like something was covering a portion of the quarter while the rest of the coin was exposed to the environment darkenning it.
A cup holder coin. Part of the coin was protected with another coin and this one was on the bottom where the oose, happens in the holder and stained. The other coin on top of this coin protected it. If it were missing a cladding, what color would you expect to see. Note on the outer edge of these coins. The copper layer is what you would expect to see on a missing clad coin. Note how the strike on this one is strong on the copper colored areas. That means the clad was missing pre-strike.
Post strike peel, leave the design of the devices weaker on the remaining ghost image: Same for cladding that was peeled off post strike: Note the area was struck, but then peeled off the coin later.
That is a stain, another quarter was resting on top of this one, protecting it from the elements. Which is why you see that only the outside of the arc is toned.
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