Collectible coins, particularly those from the United States, encompass various types, including commemorative issues, bullion coins, and circulation pieces. The 1838 One Dollar pattern coins are significant as they represent trial strikes meant to test new designs before mass production. These coins, often made in limited quantities, are highly sought after by collectors due to their historical value and rarity. Patterns and trial coins from this era can command high prices at auctions, reflecting their importance in the evolution of U.S. coinage.