Verdi-Care worked for me several times with coins in this condition. Follow directions from the manufacturer and Bob's your uncle...
Thanks for the article! Now I know about the "twelve ancient coins" of Japan!
Another fact that sometimes gets mentioned is the surprisingly low "collection rate" of the lower-denomination coins, such as the 10 Won coin....
I wish I knew the right answer to that... Authenticity for these older pieces is important. They do get counterfeited. I really just don't...
Seeing the surface (the dark areas next to the devices contrast with the lighter fields), I can understand your concern. I really hope you can...
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