By W. Ottway & Co. Ltd. of Ealing, London, a well respected manufacturer of optical equipment established in1840. This No.16 gunsight is made from black painted brass. 1916 dated. Approximately 14cm in length x 7cm max height. Adjustable knurled eyepiece and removeable painted brass lens cover. Shows use and wear but the optics are still quite clear. Well marked. Believed to have been used for artillery guns and mortars during WW1. Stock code M23640.