Collectible coins from the United States, particularly the 2014 series, can include various denominations and special editions. A roll typically contains 50 coins, often in uncirculated condition, and may feature designs commemorating historical events or figures. Coins minted in Philadelphia are marked with a "P" mintmark and are popular among collectors for their quality and significance. The dollar coins from this era may include the Presidential Dollar series or other unique releases which appeal to numismatists seeking to complete specific collections.