Collectible coins can be categorized into various types, including numismatic coins, bullion coins, and commemorative coins. Medals, distinct from coins, often commemorate events or individuals, such as the Agricultural Mechanical Society Award Medals, which recognize achievements in agriculture and mechanics. The 1909 Harkness medal is a notable example that reflects the historical significance of agricultural advancements in the United States. Collectors value these items based on their rarity, historical context, and condition.

Item Denomination Series Year Mint
1909-- (Unknown) Agricultural & Mechanical Society Award Medals - Harkness Other / Varied Agricultural & Mechanical Society Award Medals - Harkness 1909 Unknown