French trench periscope in painted wood. Square section, painted grey-green, 77.5 cm long. Mirrors intact, a few stains. Manufacturer's stamp Berthelemy Ponthus et Therrode de Paris. The lids are functional. A fixing tube on a shaft or branch on the back. Wear from use, patina. French trench periscope in painted wood. Square section construction painted in field grey green and measuring 77.5 cm in length. Mirrors intact with some staining. Marked by the manufacturer Berthelemy Ponthus et Therrode of Paris. Shutters functional. Rear mounting tube allowing attachment to a pole or branch. Service wear and patina