Collectible coins encompass a variety of types, including commemorative coins, bullion coins, and historical coins that often have numismatic value beyond their face value. The American Institute Medals, established in the 19th century, include significant awards like the Harkness medal, which was first issued in 1858. These medals are part of the broader category of collectible coins and artifacts, often appealing to collectors due to their historical significance and unique designs. The term "unknown" may refer to specific issues or variants within these collectibles that lack comprehensive documentation or provenance.

Item Denomination Series Year Mint
(1858-68) Hark-60 American Institute Bronze Ms Other / Varied American Institute Medals - Harkness 1858 Unknown