I assume it was sold in order to give the landowners a share of the value. Much as I am in favour of donating finds like this, few detector users are wealthy enough to be able to fork out half of its value.Spot the error in logic. The coin and its full value belong to the LANDOWNER. The coin does not need to be sold to give the landowner what belongs to him. It is not up to the finder to give the owner half the value of what is already his by the laws of the land. In reality objects like this are sold to give 'half the money' to the artefact hunter (metal detectorist). You know, those people who say they are "not-in-it-fer-the-money, just-the-histry" but then make the farmers sign agreements obliging them to give all away their property to (and split its value fifty-fifty with) a guest on their land.
Vignette: Tekkie weasel words with the sole purpose of cheating Farmer Brown.