Hard to believe it got past QC at the mint. If you have one I’d hang on to it. It may be valuable to collectors.
L
i am under the impression that in the coin world, there are defects and then there are defects.
the first type of defects do not affect intrinsic value. these would include overstrikes, or defective dies, for example.
the second type of defects affect the intrinsic value. this type of defect would include shaving the edges off of coins, making them thinner, and/or diluting the precious metal content of the coin with junk metal.
the first type of defect is usually accidental.
the second type of defect, in history, is usually intentional, and reflects fraud on behalf of the producer.
in the usa, traditionally, iirc, coins go through a strict quality control process. the process is designed to detect any defects.
imho a reduced weight coin, even if the amount reduced is small, would be relatively easy to detect in quality control.
i will just note for convenience here that according to the FAQ, questions are handled by telephone only during normal MST business hours.
https://catalog.usmint.gov/customer-service/faqs/