South Africa 1927 ½d Springbuck Vignette Part-Omitted

1927 Pretoria ½d Springbuck variety CENTRE VIGNETTE PARTIALLY OMITTED (SG 30var / CC 29Pvar / Issue 2 UHB 33 V7, approaching SG 30b, cv£3500). VF/UM block of four, variety on bottom right stamp. The other three stamps' vignettes all shifted slightly to right. Spectacular block, rare.