South West Africa 1924 KGV Ovpts Type VIa Proof Impressions Red

1924 KGV Overprints Setting VIa, 9½mm between, "South West" 16½mm long. Block of 24 (12 pairs) OVERPRINT PLATE PROOF taken IN RED on thin white glazed paper printed in green "Native Affairs Department'. From the upper left sheet corner, large margins top & side. The bottom right impression shows RAISED SOUTH WEST / AFRICA. Some creasing. A scarce proof block. See additional image.