Griqualand West 1874 SG1 1d on 4d Manuscript with Cert, Rarity

1874 1d in red manuscript on 4d blue (SG 1). An unused part OG example with wing margin at left. Demonstrates the correct colour for this manuscript surcharge together with characteristic show-through of the pen stroke to reverse. A premium example of an exceedingly rare stamp. Signed: Pemberton. Photo-cert: Eichele BPB. (cv£1800). See clickable additional image and of certificate below.