GREAT BRITAIN. Britannia Proof Set (4 Pieces), 1993. London Mint. Average Grade: GEM PROOF.1) 100 Pounds. KM-953a. Mintage: 500.2) 50 Pounds KM-952a. Mintage: 500.3) 25 Pounds. KM-951a. Mintage: 500.4) 10 Pounds. KM-950a. Mintage: 1,500.KM-PS85. 1.85 oz AGW. Sold with the box of issue and COA.