CANADA. 2 Dollars, 1999. Ottawa Mint. NGC MS-68. cf. KM-357/KM-357a (for obv./rev.). No reverse ring mule. The reverse die for the proof issues featured no inner raised ring, while that for the business strikes did. A small number of business strikes, issued for uncirculated sets, were struck with the erroneous proof die. Highly brilliant and exceptional, this is a rather SCARCE offering. From the Mayer Collection of Canadian NGC Registry Sets.