This is a groat from the second reign of Edward IV (initial mark 'heraldic cinquefoil', dating it to the period 1480-1483 AD) of London mint, with fleurs on cusps of tressure. It also has a rose on the breast and is listed in Spink under number 2100, North volume 2, number 1631, Type XXI. This is quite a common type and would grade round VF so would have a retail value in the order of £150 or so. Chris Wren