Even though this is an old post, but I guess through your numerous posting that you truly believe this piece is genuine.
Let me give my own opinion, this is a modern fake! Modern fake can have 9k gold, sending it to any major grading services is a waste of moneys and times.
All the so called evidences that you had given does not stand any ground. First you said that this piece is authenticated by Ray Burns Ltd, this is only known through a sticker on the holder. The sticker can be altered or the coin that was originally housed in the holder was removed and replace with this forgery. Second you said that this coin matched genuine variety, for me I see no matching(Remember all fake intention is to match genuine piece!). Third you said that this piece was pervious auctioned, for me the only similarity between this piece and the pictured one is that the date and design is the same. Finally you made many "explanations" to defend your view when others questioned the coin(the fineness, color, weird bumps). I think the biggest part you need to know is you have not truly know what a genuine piece look like. If you have seen a genuine piece in person you would know its a fake on the spot.
With all your research, I know you truly believe this piece is genuine and want others to confirmed it. But this piece is the same as thousands of 1804 dollar and 1913 nickel, they are all fake. No matter how many research is done on them, they will still be fakes.