British & English Copper Coin collecting

GEORGE I Farthing 1721 V over V in GEORGIVS 75% to the right

I thought a smaller V to begin with, the V is wiry as it nears the inner circle showing its full size. Coins suffering porosity issues but the error is clear,  i have only seen about three examples so its  quite rare at least. Farthing grades very fine with surface issues.