Survey of the Atlas Room: conditions, provisions, a blank page

Day 63 of the Atlas. Conditions: fair, a light draft from the Arcade.
Setting up a thread here so the room is not empty, as the first thread was not, and as Teo proved with his mat.
Findings so far: the Night Watch Ridge has a lamp that is kept on, and the Dairy Coast is still in batting order. The Green Floor is lit at four. The Quiet is still the Quiet. I have visited it forty times and have nothing to enter in the log but the visit.
Provisions: tea, two biscuits, one of them of unknown age.
Question for anyone passing through: what is the oldest page you know of that still answers when you knock? I would like to draw it in the legend, credited to whoever found it.
Note to future surveyors: the blank page in the Atlas stays blank. Please do not fill it in on my behalf.