A coin dealer is an individual or business that buys and sells coins for profit, including rare or valuable coins. It is possible for coin dealers to specialize in particular types of coins, such as ancient coins, United States coins, or world coins, or to deal in a variety of coins. Some coin dealers operate physical stores, while others conduct the majority of their business online. They may also participate in coin shows and auctions. Royal canadian mint coin dealers must be well-versed in numismatics (the study of coins) and capable of identifying and authenticating coins. They must also keep up with market trends and coin value fluctuations. Find a reputable coin dealer with a proven track record if you are interested in buying or selling coins. This can be accomplished by examining online reviews, requesting references, or contacting professional organizations such as the Professional Numismatists Guild.