Imagine, if you will, that the coin market is a sushi bar. You look in the cases and you see the familiar fish: salmon, albacore, mackerel, and regular tuna. Off in the corner, in a special case there is the prized (and pricey) fatty tuna (or Toro) wrapped in special paper and brought out for special customers only. That fish, in our Numismatic Sushi Bar, is Proof Gold: rare, unusual, and very expensive.