South West Africa 1935 Voortrekker Double Ovpt UM Block, Cert

1935-36 Voortrekker Fund 2d+1d OVERPRINT DOUBLE variety (SG 94b/CC 121c). VF/UM bottom left corner block of four. Scarce in multiple thus. Photo-cert: Eichele BPB "A rare positional block with fresh colours and fine centering.". (cv£500+). See additional image and of certificate below.