Collectible coins are items valued by collectors for their historical significance, rarity, or artistic merit. In the United States, various types of collectible coins include patterns, which are experimental designs or prototypes created to test new coinage before official production. The 1977 patterns, for instance, represent unique designs that were not mass-produced, making them sought after by numismatists. These coins often carry intrinsic value due to their limited availability and the stories behind their creation.