Ribbon: Red with black/red/yellow central stripe and the year of award.
	   Instituted: 10 August 1950.
       Awarded: For a high level of technical skill and a willingness to train others.
	   Grades: 1, but each year is dated.
  
    | 1950 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1951 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1952 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1953 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1954 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1955 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1956 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1957 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1958 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1959 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1960 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1961 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1962 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1963 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1964 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1965 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1966 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1967 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1968 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1969 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1970 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1971 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1972 |  |  | 
  
    | 1973 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1974 |  |  | 
  
    | 1975 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1976 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1977 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1978 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1979 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1980 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1981 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1982 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1983 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1984 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1985 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1986 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1987 | Sorry - no picture of obverse | Sorry - no picture of reverse | 
  
    | 1988 | Sorry - no picture of obverse | Sorry - no picture of reverse |