Irish 1 Punt, 1990, with a £ sign.
The British would never do that.
Could also be a way of combining two languages: The name of the currency unit, spelled out in Irish, is "punt" while "£" can be read as the English "pound" too.
When the final designs for the common sides of the euro coins were presented, I found it surprising that the "€" had not made it so to say: On the euro notes it is used, but not on the circulation coins. May have something to do with the currency name being new ten to fifteen years ago. The € does show on some commemorative and collector coins though.
The $ sign is also used on Mexican peso coins (see below; images from the central bank). Interestingly, they seem to do it the other way round - as far as I can tell (have not checked all current denominations) the paper money says "pesos" as a word only.

The US and Canadian dollar coins and notes do not use the $ symbol either, I think. The only exception that I know of, in today's money, is the US $1 coins of the Presidential and Native American series ...
Christian