1.445 ozt 4 Governors General Silver Medal

This is a 1977 Canada Governors General Silver Proof Medallion.
 
It features profiles of four Canadian Governors General:
 
Vincent Massey (1952-1959), Georges Vanier (1959-1967), Roland Michener (1967-1974), and Jules Léger (1974-1977).

Content is 1.445 ozt troy ounces of fine silver

Mint: Royal Canadian Mint

Weight: 48.6 g or 44.955 g fine silver

Purity: 92.5%