BRITISH WEST AFRICA: George V, 1910-1936, uniface brass 6 pence, 1920-KN, KM-—, trial strike in brass for a type struck in tin-brass for circulation (KM-11b), PCGS graded Specimen 66, RRR, ex King's Norton Mint Collection.
Only 2 pieces known before King's Norton Mint release, now perhaps between 5 and 10 pieces. NGC & PCGS have each slabbed only 1 piece (MS62BN for NGC and this piece at PCGS).
Estimate: 1,300-1,500 USD