96k - (July 1963 - 12 August 1978 ) rated common
96o - (1 June 1963 - 5 November 1988) rated common
Left to right; 96k, 96o
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Putzel ratings
96k - 451 rated 4 on stamp and 20 on cover
96o - 450x (Update) rated 4 on stamp and 20 on cover
96o - 450xa (Update) rated 4 on stamp and 20 on cover
96o - 452 rated 2 on stamp and 10 on cover
96o - 452a rated 2 on stamp and 10 on cover
? - 450 rated 10 on stamp and 50 on cover
