Collectible coins encompass a wide range of numismatic items, including historical coins, commemorative pieces, and medals. The American Institute Medals, such as the Harkness Medal, are specialized awards given for notable contributions in fields like science and architecture. These medals often hold significant historical value and appeal to collectors interested in American heritage and achievements. The United States has produced numerous collectible coins and medals, reflecting its rich history and cultural milestones.

Item Denomination Series Year Mint
(1856-1860) Hark-80 American Institute Bronze Ms Other / Varied American Institute Medals - Harkness 1856 Unknown
(1858-68) Hark-60 American Institute Bronze Ms Other / Varied American Institute Medals - Harkness 1858 Unknown
(1877-1897) Hark-190 American Institute Bronze Ms Other / Varied American Institute Medals - Harkness 1877 Unknown
Undated Hark-70 American Institute Gold Ms Other / Varied American Institute Medals - Harkness 0 Unknown