Johannesburg Numeral 99 Postmark
99j - (14 August 1978) rated common99l - (1 December 1989) rated common
Left to right; 99j, 99k
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Putzel ratings
99j - 460 rated 10 on stamp and 50 on cover
99j - 461 rated 4 on stamp and 20 on cover
99j - 462 rated 2 on stamp and 10 on cover
99k - 462x rated 2 on stamp and 10 on cover
