how can you tell if a coin is a proof coin

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How can you tell if a coin is a proof coin?
These coins:Are struck at least twice, which gives the coin a frosted, sculpted foreground for a glamorous shine; defined, intricate design; and mirror-like background.Come with an official Certificate of Authenticity.Are encased in a protective capsule.
Not: Yatırım tavsiyesi yerine, finansal hedeflerinizi göz önünde bulundurmalısınız; o yüzden bu bilgiler yatırım tavsiyesi değildir.