With Real Estate, it's Location, Location, Location. With coins, it's all about quality. Coins graded by Numismatic Guaranty Corporation (NGC) and Professional Coin Grading Service (PCGS) Mint or Proof 69 are top quality. Since coins are graded on a scale from 1 – 70, 69 is just one point away from the highest possible grade. Get the quality coins your collection deserves—Proof or Mint State 69.