Canada. Complete set of 20x $20 Aviation Coins, Series I and II. Sterling Silver with 24K Gold covered cameo 1990 - 1999 Canada's aviation heroes and achievements are celebrated in this timeless set of 20 coins. These coins were issued two per year over a period of ten years. Each proof sterling silver coin contains a 24-karat gold covered cameo featuring the aviation hero being commemorated. The complete set if divided into two series... * Series I 1990-1994: "Powered Flight in Canada, The First 50 Years" * Series II 1995-1999: "Powered Flight in Canada: Beyond World War II"