I love dipping into the Capuchin Annual’s on occasion, they produce not only great features but pages of old Dublin advertisements. In the 1936 annual, this image below caught my attention.
‘Could not see the joke. British soldiers unaware of the inscription on their armored car!’
'Up Sinn Féin' graffiti.
There is certainly a substantial article to be written yet on graffiti, street postering and the like during the War of Independence and into the Civil War.
Click on the book for more.
Click on the book for more.
Donal
Ciarán
Sam
Come Here To Me! 
I love the penmanship. That’s the hand of someone who’s been through the Presentation Sisters.
It’s obviously not on the armoured car but was added to the photo, unless it was written on the car with a very large pen.
Here’s a snap from a slightly different view point!
http://www.dublin.ie/forums/attachment.php?attachmentid=90703&d=1327576444
Building behind anyone?
Mountjoy Prison was mentioned elsewhere?