The nearest look out post to the Blasket Islands is Dunmore Head which is on the mainland. It was LOP number 38. There wasn’t a LOP on the Great Blasket that I was aware of and most signs were linked with the nearest LOP hence the classification. At the moment, it does not look to me as though the number is intact for this location so I cannot confirm absolutely.
Location on Google is clouded over.
If you look carefully at the base of the tower, you can just see the remains of the R and the E at the end of EIRE.
There is actually an historic aerial photograph of this sign too which the Military Archives have published on their social media/Flickr stream
Bing Image, collected January 2013
No Google Maps image for this location
This sign was linked to LOP58, given as Corraun, Co Mayo. It’s actually in the Currane estate, a little further east than Corraun I think and it’s not in the worst condition, The number is still in place, although slightly damaged.