Quadrum And Eagle Coin Holders

I know that Air-Tite makes capsules with a foam ring insert, to accommodate different sizes of coins.

From experience, I can say that if the coin size does not match the holder size, there is a very high likelihood that the coin will move in the holder. The movement may be small, but it is movement nonetheless. The potential for damage is relatively small, but it does exist.

I would say that the extent of potential damage depends on the condition of the coins being placed in the holders. Circulated coins are not likely to show much in the way of damage, but high-end mint state or proof coins are more prone to exposing even the smallest of surface disturbances due to movement in the holder.

I put my non-slabbed coins/medals in Air-Tite holders with the foam rings to hold the coins/medals securely. These holders can be placed in coin boxes as well.