Brass WW1 Naval Gunsighting Telescope

A WW1 British Royal Navy gunsighting telescope in heavy brass. 24-inch long power 8 telescope with a 2.5 inch diameter lens. Separate rangefinder sight with screw-on cover. Adjustable lens. Dated 1917. Extensively marked with W. Ottway & Co of Ealing maker mark, patent stamp, war office crows foot stamp and the word 'Gunsighting' Full working order