I, the poet William Yeats, with old mill boards and sea-green slates, and smithy work from the Gort forge, restored this tower for my wife George; and may these characters remain when all is ruin once again.

Until we get a photograph of this plaque from a contributor on Flickr or Wikimedia Commons, you can have a look at it here:
http://www.galwayphotographssite.com/misc/yeats_plaque.html

fifteenkeats on Flickr
See also...