Examples of the type
1973 PM – (en) Proof
1974 PM – (en) Proof
1975 PM 
– (en) Mackay#248
– (en) Mackay#248
1976 PM – (en) Mackay#253
– (en) Mackay#253
1977 PM – (en) Proof
1979 PM
1979 PM – (en) Proof
1980 PM – (en) Proof; Viking ship privy mark
1983 PM – (en) Proof