Coin collecting question

Quick question, What’s the best coin case for collecting Pokemon coins? I just got an Imakuni Doduo coin and I want to put it in a hard plastic case, but I don’t know which size is the best. I want it to be as snug as possible without damaging the coin of course. This is the smaller sized Japanese coin. Thanks in advance for any info!

I would measure them then take a look at the dimensions of more obscure U.S. currency, which are more likely to have plastic holders for them. Something like a quarter or larger like a Susan. B Anthony Dollar or Gold piece denomination.

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