South Africa, Reserve Bank, specimen 20-Rand (2), ND (1961), serial number D/1 00000, one example purple and multicoloured, one green and multicoloured, Jan van Riebeeck at left, animals at left, de Kock signature, rev. purple and green respectively, mining scene (P.107a), perforated, SPECIMEN overprint, letter in top right margin, good extremely fine, rare (2)