envelope / 'Censored', G.P.O., 1916

One of five envelopes (which had passed through G.P.O. 1916 and bear Censorship - British? - tags) addressed to Messrs. Watkins, Jameson Pim & Co., Ltd., Ardee Street Brewery, Dublin, dated (postmarks) April 25, 1916 (? etc.) Came in while Volunteers in occupation and left there on the surrender. Apparently opened by the Volunteers.;