An early 20th Century German Zeiss military prismatic binocular periscope, "Relief-Scheren-Fernrohr Nr 2272, Vergr [magnification] =10x20, Specif. Plastik=11", having 40 mm objective lenses and pairs of individually focused oculars on turrets, bearing engraved British War Department property marks and "B.S. No 7", in leather-covered wooden backpack with objective shades and eyepiece filters, circa 1910s-1920s, (in little-used condition with clear optics), approx 40 cm high