From what I can see, it apprears to be an area polished out to cover a clash. The polishing removed some devices that are slightly below the field. Thus the area flat near the eye. I don't see any other clash marks except one on the reverse under the arrows and between the leaves. The nose is a deeper device and just part of it was polished. Seems like an fresh die state from the other devices. Maybe they were working over an imperfection on the die?
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