Johannesburg Numeral 172 Postmark
172j - (22 July 1957) rated Common172k - (19 December 1981 - 1988) rated Common
L-R 172j, 172k
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Putzel ratings
172j - 590 rated 2 on stamp and 10 on cover
172k - 590a rated 2 on stamp and 10 on cover
172k - 590b rated 2 on stamp and 10 on cover
