Third light of the lower row of the stained glass window in the staircase with the coat of arms of Henry II], and a picture of the present Royal Exchange in London. “Presented to the City of Londonderry by the Worshipful Company of Mercers. London: A.D. 1912”. The stained glass window was manufactured by Campbell Brothers in Belfast, destroyed in 1972 by an IRA bomb, and restored by Calderwood Glass, Newtownabbey.