The Plough, corner of Abbey Street and Marlborough Street, Dublin 1
The Plough underwent a number of sign changes as can be seen from this image taken in 1976 and this one from 1990. Both of those images are part of the Dublin City Public Library “Dublin Pubs” image collection.
23.03.14 edit: The Plough signage has been removed, revealing traces of another ghost sign. Check out this post on E.J. O’Brien.