TANGIER: 1948 KGVI Royal Silver Wedding 2½d SPECTACULAR MISPLACED OVERPRINT (SG 255var see footnote SG 255a). VF/M/UM left marginal block of four. Lovely representation of this scarce variety from the single affected sheet that gave rise to the overprint omitted on the six stamps of the top row. The shifted overprint is mentioned and priced by SG in the footnote following SG 256. (cv£1000). See additional image below.