irishpapermoney.com

Series B specimen notes are known for most of the signature varieties. Attached are examples of the £1 and £5 notes for the Murray, O'Murchú signature combination. What appears to be the year of issue is referenced on the reverse, bottom right.

Here's a set of Specimen notes from the 1980s with O'Cofaigh, Doyle signatures.

The letters used on some (£1, £5, £10) of these Specimens have strayed from the base letters of the issued notes.

Here are £10 and £20 specimen notes with another signature combination: Murray, O'Cofaigh. Specimens were also probably issued for the £1 and £5 notes of this type.