Watch List notes:

The Milton Collection Part Two, World Coins and Tokens, British West Africa, George VI, shilling, 1952, trial striking in steel, crowned bust l., by Percy Metcalfe, legend without IND IMP, TRIAL in small raised capital letters before face, rev. palm dividing date, value below, TRIAL in small raised capital letters above 52 of date (KM.TS3; FT.326), a choice example, certified and graded by NGC as Mint State 67
*ex Carl F. Chirico Jr. Collection of World Pattern Coins, Bowers and Merena Auction, 7 March 2008
A number of these trial shillings were minted in the 1950s with which to test vending machines.