R & J beck 6x officer’s trench periscope

An excellent World War 1 (1914-18) British Army officer's trench periscope, 6x magnification, extending from 27" to 33" (69cm - 84cm). Dated 1918 and marked with the serial number 5641, the maker's name, R & J Beck Ltd of London and also the model, Periscope No25 6x. Working order. Complete with original leather case. NOT FOR SALE