Collectible coins encompass a variety of categories, including standard issue coins, patterns, and trial coins. The 1836 one-dollar pattern coins, specifically, are notable for their unique designs and were created to test potential alterations to U.S. coinage before formal production. These trial coins are sought after by numismatists for their historical significance and rarity, reflecting the evolving nature of the U.S. monetary system. The designation "N A" indicates a specific grading or attribution, which can enhance a coin's value in the collector market.