Quote:Yes, unfortunately, the process of making one of these "
Encased Coins" damages the coin - they crush part ofthe rim down ti a thin strip, then wrap the aluminium casing around the strip. This prevents the coin from simply falling out. Modern bimetallic coins use much the same principle, to stop the central plug from falling out too easily.
You occasionally find a coin that has been liberated from such encasement; they look like this American example - and all you have is a "damaged coin" that might get mistaken for some kind of mint error.
So the coin no longer exists as a "coin", to be graded separately. Any grade given is applied to the whole piece; in instances where the coin is heavily worn but the encasement is still pristine (if the original coin had been well-worn when it was encased), it is the condition of the encasement that determines the item's condition.
I deviated a bit from the subject with my previous comment, but for the rest, I share your opinion.