LESOTHO 1980 (MNH) 5S/6S/5C BROWN DIAMOND PLATE 1C–1C–1C–1C BLOCK
5s/6s/5c Brown Diamond bottom left corner plate 1C–1C–1C–1C block x 4. Fresh and fine. Mint never hinged. SG410A; SC304a
Note: first surcharged '6s' typo locally and then re-surcharged litho in London with '5s' and a Basotho hat emblem (to obliterate the locally-applied '6s')