Damon Ward asked if I could identify and value this coin for him. The condition isn’t good but enough detail shows up for me to provide a full ID.
The size (22mm) and general appearance of this coin add up to it being a London halfgroat of Edward III. On the obverse the mark at the start of the legend is a square with four incuse petals forming a cross. The lettering isn’t particularly clear but the letter R appears to have a wedge-shaped tail.
With the characteristics just mentioned this Edward III halfgroat will have been struck during the fourth coinage, pre treaty period, series C. In the Standard Catalogue the type is listed as number 1574.
Damon’s find would grade no higher than about Fine and the flan looks to be uneven. In its present state of preservation my price range would be £20 – £25.