I explained above where I came up with my numbers.
I’ve also done searches for world currencies prior to flying, and have not always found money exchanges or banks that offer those exact rates.
In the case of trading Classic gold for Retail gold, it may also be walking a fine line. One that likely isn’t supported should something go wrong.
For what it’s worth, I am not claiming any special knowledge or insight into these numbers, and I don’t think I would personally risk making this type of trade.