The images of this coin are greatly enlarged so it could be mistaken for a penny. It’s actually a halfpenny and it is a very recent find that was unearthed by Anthony Hopkinson.
On the obverse the legend reads +EDWARDVS REX ANGLI around the bust of the king. The reverse is of the ‘standard’ type. It has a cross patter with three pellets in each angle and the legend reads CIVI TAS LON DON.
Halfpennies of this type started to be struck during the reign of Edward II and their issue continued into the reign of Edward III. In the Standard Catalogue the reference numbers are 1472 and 1536.
I’ve already had one of these on my website, which is strange as this type of halfpenny is quite scarce. This example would grade Fine+, so it is better than the last one. To a collector who is aware of the scarcity of this particular type, this coin shouldn’t be worth any less than £60.