Original British WWI Mk IX Trench Periscope By R. & J. Beck Ltd. Dated 1918 Cannons & Mortars 000 Polish prisoners from the

000 Polish prisoners from the German September 1939 offensive

Consisting of an oval shaped oak wreath in bronzed zinc

75 in) blade and an overall length of 514 millimeters (20

Three officers in the trench were killed

all also remaining undamaged and functioning properly

Original British WWI Mk IX Trench Periscope By R. & J. Beck Ltd. Dated 1918 Cannons & Mortars 000 Polish prisoners from theOriginal Item: Only One Available. A periscope is an instrument for observation over, around or through an object, obstacle or condition that prevents direct line of sight observation from an observer's current position. In its simplest form, it consists of an outer case with mirrors at each end set parallel to each other at a 45 angle. This form of periscope, with the addition of two simple lenses, served for observation purposes in the trenches