This is an example of a WWI Model 1918 trench periscope no. 10x7.5 with leather carrying case as manufactured by Wollensack Opt. Co. of Rochester, New York. It is stamped with the serial number "5616" and retains the brass eyepiece cover. Brass construction with wood handle. The carrying case is stamped "W.T.&B.CO./1918/G.A.C."

Very fine, retaining 80% original green paint. The case is fine with some minor handling marks. The stitching is tight.