170 (9) 1900 6d on 3d purple on yellow Q Victoria of Bechuanaland Protectorate surcharged and overprinted "MAFEKING BESIEGED", only 1440 surcharged, only 10 mint examples thought to exist (per Rossi), a massively undercatalogued mint rarity, missing from the landmark Sir Maxwell Joseph and Maria de le Quellerie collections, it took us decades to find the mint example in our reference collection!, this is only the second mint example we have seen!
