The "QA" which stands for Quality Assurance which is an extra grading standard. Most of the coins graded will not meet these standards and will not receive this label. These coins comprise less than 1% of all coins.
What is 1% of the already low population of this coin? I contend that this is better than being the first release grading. More information can be acquired online in your search engine using "qacoins. The coin and items in the picture above are what you get including the CoA.
Gaudens $20 Gold High Relief NGC MS70 DPL-QA (Quality Assurance) Finest" is in sale since Wednesday, June 6, 2018. This item is in the category "Coins & Paper Money\Bullion\Gold\Coins". The seller is "sdjunda1" and is located in Palm City, Florida. This item can be shipped to United States.