S*ilvertowne is a well-known numismatic firm in Indiana with a colorful history, in business since the 1950s. I used to visit them when I lived in the midwest. They own a private mint which manufactures silver rounds and were among the first to pitch coins on TV. S*ilvertowne's founder, Leon Hendrickson, passed away last year at the age of 90. I've never come across one of their certificates but I suspect it had more to do with marketing modern world coins than providing authentication services.
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