Mebbe you confused Anglesey (in Wales) with Alderney (near Jersey), muntenman, but in a sense you are right. The Anglesey halfpennies did circulate widely, so they might well have reached Jersey. More important, in a subsequent wave of token issues, Guernsey, Jersey and Alderney took part with altogether 13 different types, some of which I find of doubtful origin. Strangely, I have found that the silver tokens are easier to find than the copper ones. The picture shows the obverse of the highest value: the three shillings. The 18 pence piece is similar, but smaller.
Peter