1902 Great Britain Farthing For Grading

These coins were "Blackened" at the Mint after being minted.
Some of the blackening has been rubbed off but this still looks to be Uncirculated to me.
MS62/63 BR

I doesn't look like wear to me (I could be wrong, The Gods know I have before ) .
I don't know the process they used to "Blacken" these coins Maybe a more learned collector could "Enlighten" Me,
But it is only a super thin layer over the original lustre of the coin and is prone to the least amount of friction.
This coin is graded PCGS MS64 and there are small areas the "Blackining" have been lost.

http://www.PCGS.com/cert/33193769

I can't see any real wear on the OP's coin and it still has that underlying lustre that's why I called it at MS62-3

Indeed they were blackened, it was to deter people trying to pass off extremely lustred farthings as half-sovereigns which became quite a problem.

It's also not lustre underneath, they didn't just coat the coin with a dark patina, they toned it a dark colour, so any lighter colours in this example will be the result of wear.

The link you posted hasn't had the patina removed, as I said it is the colour of the coin and not a layer, it is just that the toning process has not affected this coin as severly as others. You do also find years that missed the toning process altogether, and are much more sought after.

EF ...for me feel the reverse would look better out of the flip.

These coins were treated with Sodium Thiosulphate (Na2S2O3 photograpic hypo) by the Mint to artificially tone them. This was done to avoid confusion with the Half Sovereign, which used same same obverse dies for both coins.

The artificial toning is copper sulphide, which is a grey / black colour.

I would think AU58 because some of the metallic bronze is showing underneath the high point on the beard. For that to happen, a tiny amount of wear must have taken place to expsose the metal.