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.

(Bing)

Location on Google is clouded over.