The Bank of Ireland wanted to be sure everyone knew what this coin was. It was not a coin, but a bank token, issued to help alleviate the severe coin shortage in Great Britain during the late 1700s and early 1800s. They are struck in silver and come in 5 and 10 pence denominations. Some have shamrock designs on the reverse side.
Finding worn examples is not too difficult, but tokens in better condition tend to pick up significant collector values.
worn: $25 US dollars approximate catalog value
average circulated: $50
well preserved: $120
fully uncirculated: $250
There is a great web site dedicated to Irish coinage. It's called (what else?) IrishCoinage.com [Press Here].