1911 AD., Great Britain, George V, Farthing, KM 808.1.

Great Britain, George V, engraver: Edgar Bertram MacKennal (obverse), 1911 AD.,
Farthing (20 mm / 2,76 g), bronze, mintage 5.196.800 , dark finish,
Obv.: GEORGIUS V DEI GRA: BRITT: OMN: REX FID: DEF: IND: IMP: , (George V by the Grace of God, King of all the Britains, Defender of the Faith, Emperor of India) , king George's head facing left.
Rev.: FAR-TH-ING / 1911 , Britannia seated right, holding a trident in left hand, shield in right, denomination above, year below.
KM 808.1 ; Spink 4059 ; Peck 2322 ; Freeman 589 .

1911-18 farthings were chemically darkened, to avoid the being confused for half sovereigns, these were very similar in size.