BRITISH WWI LIFEGUARD TRENCH PERISCOPE

The trench periscope, which operates on a cantilever method, folds down into a small square measuring 10.5cm x 5 cm deep and fits into its own canvas pouch; this example has its full green, red and white manufacturers' decal affixed to the front, with its original paper-wrapped pouch containing the reflector optics.

Ref; 94413