For example a search for coins with 2 as face value within the UK returns the following:

however a search for 1995

returns only coins with 1995 not in brackets. so although the coin does not have 1995 in the year it is attributed with 1995.

I feel that this is an error with the searching algorithm and it is also the same for banknotes, where it will be more of a problem as many notes do not have years on them.