In 2018 I first visited the Quarters of the guards, they have a mosque (Mescit) of their own. Going up a flight of stairs and turning to the right one then enters a first roiom of the Harem. In that room (I think) I took this picture of what I took to be the outer wall of the mescit. I am not quite certain, it may have been in the next room, which is called the Hall of the fountain.