The best thing to do is go to the web site for NGC. But expect $50.00 bucks.
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I recently purchased an 1885-S Liberty $5 gold coin that had been graded MS-66 by ANGS. Another Numie and I examined the coin upon receipt. It obviously had been "whizzed" and when it was spun the word "LIBERTY" had almost been obliterated. The best way to tell an improperly cleaned, spun, or whizzed GOLD specimen is to weigh the coin. If the weight has been reduced by .001 gram or more, well.....that gold went somewhere and it wasn't lost by rubbing against someone's pocket while in circulation. PCGS, NGC, or even NNC would have returned the coin as non-gradable. People say "buy the coin, not the grader"......sorry guys, it doesn't work that way these days!
No, I can't seem to find -any- information on them. I wouldn't buy an NGA slabbed coin unless you felt that the price was right and you can tell (hands on preferably) that the coin meets your specification. Most likely NGA is a front created by a coin dealer to mark up common coins by certifying them as MS-70/69 when in reality they might only grade MS-63/4 by PCGS/NGC. So no, I would not classify NGA as a reliable grading company.
Messier 14 or NGC 6402 has an apparent dimension of 11 minutes of arc.
Coins are certified by services like NGC or PCGS. It is expensive, so it isn't worth it unless the coins are really, really valuable.
This could be worth a couple hundred dollars, if genuine. You would need to have it examined by a professional (and probably certified), to determine if the error was something that happened at the mint, or if it is something that was done to the coin after it left the mint. There are alot of post-mint altered coins out there that are worthless. Try checking out the PCGS, NGC, or ANACS websites for details on how to get it examined and/or certified.