Click to expand Tap to zoom 2006 Royal Mint Blue Box United Kingdom Proof Coin Collection 13 Coin Set w COA $99.50 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart 2006 Royal Mint Blue Box United Kingdom Proof Coin Collection. 13 Coin Proof Set w/Royal Mint packaging and COA.