The best part about collecting coins is that it will be whatever you make it. It can be a passive hobby that you do occasionally, or something that you really dive into, studying the ups and downs of the coin market.

The “King of Coins” also known as the 1804 Silver Dollar is both extremely rare and incredibly expensive. In fact, one recently sold at auction for over 3.8 million dollars. Here’s a peek into what makes this particular coin so unique.