I found some 1981 Bailiwick of jersey coins. Have and say queen Elizabeth the second on front and a shield and date on the back. One is 5 pence, one 10 and one 50. The 50 pence is 8 sided. Other 2 are round. Does anyone know if these are silver? They feel kinda heavy like they might be. Can't find any info on them. Also have a 1981 square bailiwick of jersey coin that says one pound on the back and says 1781-1981 bicentenary of the battle of jersey. Can anybody help me with these? Thanks