I’m once more very grateful to people who tell me about these things. I searched for Eask Head’s sign through the aerial photographs 7 years ago but could not find it.
Part of it is still in place but the sign itself is in really poor repair. All you can see is the closing E.
I have been told that the sign in Howth is located here but completely overgrown. This is an updated location and the map has been updated accordingly. I’ve also been advised that there is some work being done on possibly restoring the sign. I will keep this post updated as and when I learn more.