Collectible coins are a category of numismatic items sought after by collectors for their historical significance, rarity, or aesthetic appeal. In the United States, a notable example includes the $10 gold coins, commonly referred to as "eagles," which were minted in various designs from the 19th century to the early 20th century. The Colorado Gold Rush in the mid-19th century contributed to the influx of gold coins in circulation, impacting both local economies and national coinage practices. Collectors often focus on the condition, mint mark, and year of issue when determining the value of these coins.