Watch List notes:

The Milton Collection, British West Africa, George VI, Proof nickel-brass shilling, 1949, Royal Mint, crowned bust left, by Percy Metcalfe, legend without IND IMP, rev. palm dividing date, value below (FT 79A; KM 28), certified and graded by CGS as Proof – Uncirculated 90
Ex Diana Collection, Baldwin's Auction 59 (24 September 2008), lot 1439.
The condition of the current coin appears to be typical for this issue.
(300-350 GBP)