I have been looking for something like this for some years, failure for me so far.
I am happy to know that this coin is in a small capsule.
There is a great possibility that it could be affected by underlying silver crystallization.
Fragile enough, bur very much more so, if affected by Ag X
If the capsule is small enough, it still could be enclosed in a 2x2 so that full id can be attached to the coin, and take it's place in a coin album.