Knowledge Base Products Why are the diameters of 1 oz coins and rounds different? How much is my coin worth? Can I swap the Starter Pack product for something else? Upcoming Product Releases Are your products authentic? What’s the difference between “UCAM” and “DCAM”? What’s the difference between a PR69 coin and a PF69 coin? What’s the difference between “NGC” and “PCGS”? Why doesn’t my American Eagle have a mintmark? Why does the 1 oz American Gold Eagle Coin weigh more than one troy ounce? Is it better to buy gold, silver, or both? What is “junk silver”? What are “certified” coins? What are the different types of bullion?