The product is a rare and superb gem proof mirror field crown coin from Great Britain, minted in 1927. This silver coin, with a denomination of crown, showcases beautiful luster devices and is of uncirculated condition. Its origin from the United Kingdom adds to its collectible value, making it a desirable addition to any coin collector's portfolio. The certification status being uncertified only adds to the authenticity and beauty of this unique piece of European numismatic history.