Weight? If it is lighter than normal, it may have been dipped in acid. If it is normal weight, then it was heated with a torch. Nothing in the mint process would cause a coin to look like that, so it couldn't of happen in the mint. PSD.
Grease struck would do an entirely different thing. The grease would fill the devices and they would be block out full/partially. All the devices on your coin are raised. So it couldn't be a Struck Through Grease issue: The fields would be normal. Only heat or acid would alter the fields and devices like your coin:
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