Thanks azda for your reccomandation !! I know quite well that book because I bought it last year , Yes it's very easy to use , photos could be better but , considering the price it is very good .
Personally my preferite book about english medieval coins is "English coins " by Lord Stewartby, I think it is more detailed and updated than others.
Thanks ! yes it could be a hoard coin , there are no signs of circulation .