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This is a question that will never be resolved.
When you buy a new boxed proof coin with a numbered certificate are you buying a mass produced coin and a serialised printed certificate.
There is ( I am guessing ) absolutely no association between any specific coin and the certificate that is placed in the box.
I assume the packer takes a coin from a tray and a certificate from another tray.
If I am wrong please correct as I cannot imagine the coins are arranged in the exact order of minting so the first coin which should be given CoA 00001 might be given CoA 00050 assuming there are 50 coins in a tray for packing, likewise the 50th coin minted might get the number 00001 ?? The exception MAY (?) be when there is a very limited release say 300 coins in a much higher value coin with stringent QC.
Taking into account that this is a common bullion sovereign that you are unhappy with due to a spot, I would think the only way of removing the spot is to use a q-tip with a small amount of silver polish or fine metal polish and give it a rub. You will not devalue the coin as it is only worth 97 - 103% of spot selling to a dealer or privately. Just wondering if perhaps in the coin's history someone dropped a spot of aqua-regia ( the only acid that dissolves pure gold ) to see if the coin was fake ? I assume that would leave a permanent surface mark and if so the only way of removing is to polish it out to bring the underlying metal to the surface.