It's a replica(the WRL mark is for Westair Reproductions Limited) of a coin of Roman emperor Antoninus Pius.
Replica of a dupondius of Antoninus Pius, ANTONINVS AVG PIVS P P TR P XVIII, radiate head right, slight drapery on left shoulder / BRITANNIA COS IIII, SC in ex, Britannia seated left on rock, shield and vexillum in background before. RIC 930, BMCRE 1965, Cohen 118. http://wildwinds.com/coins/ric/antoninus_pius/RIC_0930.jpg
Is there any reason to keep this? (I'm not very familiar with the coin terminology). Is there any value?
I no longer see it as a current item on their website but the value is at best a souvenir gift shop item ~$5 which no collector of real ones would be likely to pay.