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.
Republic Rounds are produced by the ISO-14001 registered Republic Metals Corporation out of Florida. One of the few mints capable of producing .9999 fine silver in huge quantity, Republic rounds can come in .9999 or .999 purity.