A proof coin is one that is struck in a way that results in a brilliant, mirror-like surface and exquisite sharpness of detail. Proof coins are considered the pinnacle of collections, marked by their scarcity and beauty. They are specially minted in order to bring out the most intricate of designs.
Certified coins are coins that have been submitted to a professional grading service, like PCGS or NGC, for a professional determination of the coin's grade and authenticity. Grading services will evaluate the coin, then place the coin in a protective slab with a label describing the details.
FS means First Strike and is a PCGS slab designation meaning PCGS received the coin within 30 days of the first release of a new coin issue.
ER stands for Early Releases. This is an NGC slab designation that tells you the coin was received by NGC within 30 days of the first release of a new coin issue.
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