All major mint errors on Platinum coins are very rare. Very few pieces escape quality control since Platinum denominations are examined very carefully.
This is the only known Canadian $100 platinum striking of any design or series. This is one of the most spectacular coins ever released by the Royal Canadian Mint. It is certified by PCGS as an "Unofficial Platinum Strike Uniface." Lab analysis determined that the metal composition is 90% platinum and 10% rhodium and weighs 16.73 grams. In 1985, the Royal Canadian Mint experimented with platinum coins and began issuing them in 1988. This is the only known platinum mint error or pattern/die trial.