What is a large coin with Parliament Shield and an eagle made in 1983 on one side 1 troy oz 999 fine silver other side.?

The coin you describe is likely the 1983 Canadian Silver Dollar commemorative coin. It was issued by the Royal Canadian Mint to celebrate the 100th anniversary of the Parliament of Canada. The coin has a face value of one Canadian dollar and is made of fine silver (.999 fineness). It weighs one troy ounce and has a diameter of 36 millimeters. The obverse of the coin features the Parliament Shield, which depicts a maple leaf surrounded by the coats of arms of the ten provinces of Canada. The reverse features an eagle in flight, surrounded by a wreath of maple leaves. The coin also bears the inscription "CANADA" and "1983."