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!
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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.
I don't know of any use of APB in coins or grading. ABP is occasionally used and it stands for Average Buy Price, or what a dealer would on average give for your coin.
it means that a porfecinal has authenticated and determaned the codition of a coin
PR is a grading system used for proof coins
The most expeditious way to get a coin graded is to locate a coin shop nearby - present the coin to the owner for grading. If he/she is uncomfortable to do so, he/she will refer you to a numismatist (experienced coin collector).