"The Farmer Wants His Half"

EBay seller sejohn4fish  (feedback:  2787),  I assume from what else he's sold, the Minelab in his avatar and his spelling is is a metal detectorist. He has several high-value coins for sale, including this one:

Rare Coenwulf penny (796-821), King of Mercia, British hammered coin, Saxon silver 1300 years old, found in Dover, Kent March 2014. Fine looking coin very rare that a coin like this comes up for public auction, need to sell as farmer wants his half, please judge the coin for your self as to the grade i am not a deller so i dont know,going by other coins i have seen i would say vf+ the only thing that lets this fine coin down is the small split as you can see in photos,a coin for the serious coin collector i am going to start the bidding @ £400.00 p@p on this item will be free,life time oppertunity to own this fine coin, couple more pictures as requested open to serious offers only

What's this about the farmer wanting "his half"? The coin is 100% the farmer's property. Sejohn4fish is therefore selling this coin on behalf of its owner and taking a 50% cut for hoiking it out of the ground and flogging it off. But he'll say he's only in it for the history of course.

Its a tribrach coin, minted by Duda in Canterbury. Here's a similar example:

 Due, no doubt, to "the farmer wanting his half", the oibject does not figure in the Portable Antiquities Scheme database which so far only has three coins by this moneyer. Probably because lots of other metal detectorists have been hoiking stuff out and straight onto eBay (he's not a particularly rare moneyer and worked over a number of years for at least two rulers). Who knows whether there is any record in the parallel private database UKDFD.