Watch List notes:

The Milton Collection, British West Africa, Elizabeth II, Proof copper 1/10-penny, 1957 (FT 304, Proof not listed; KM 32), extremely rare, certified and graded by PCGS as Proof 67 Red
Ex Arielle Collection, Baldwin's Auction 85 (26 September 2013), lot 3030.
For another example see R. J. Ford, Spink Auction 88 (14 October 1991), lot 100, sold £220 hammer.
(700-750 GBP)