If a 1 oz coin is not made by a national mint, then it is typically referred to as a generic silver coin or round. These 1 oz coins are comparable to silver maples, eagles, etc., but they are made by private refineries instead. These 1 oz coins typically have very competitive prices over spot, and yet are valued for their small size and easy tradability.
Sunshine Mint of Idaho makes 1 oz rounds with a special blank spot on the back of their design. The “blank spot” will show the words “valid” when a special decoder lense is hovered over the round. Added to the fact that Sunshine Mint refines much of the US Mint’s silver, this security feature makes Sunshine rounds stand out among the rest.