Watch List notes:

Elizabeth II, Proof Crown (Five Pounds), 2011, '90th Birthday of HRH, The Duke of Edinburgh', third portrait right, rev. PRINCE PHILIP • 90TH BIRTHDAY • FIVE POUNDS • 2011, enlarged portrait of Philip, quizzically gazing right, by Mark Richards, edge plain (S.L23), brilliant FDC, 4,599 issued of a reported mintage limit of 20,000 pieces, in Royal Mint case of issue and card packaging date stamped 20/05/11.

Estimate: £20 - £30