The two South African Republic one-penny and a half-penny postage stamp are tied by two Darkton double circle datestamp in black and dated 22nd October 1897, set at: '24.OCT.A97'. These have 'Z.A.R. in the lower circle.
Reference
Higson, A., The "Mrs Head" Correspondence, (2009), The Transvaal Philatelist November 2009, issue number 172, p.93
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