Collectible coins include various types such as antique coins, commemorative coins, and bullion coins, each valued based on factors like rarity, demand, and condition. The 1977 Philadelphia mint coins represent a significant year in U.S. coinage, as they were produced in large quantities but can still be sought after by collectors. A roll typically contains 50 coins and can encompass different denominations, including dollars, depending on the specific collection. Coins from this era may carry numismatic value beyond their face value, particularly if they are in uncirculated condition or possess unique characteristics.