細節
A World War I Trench Periscope
A PERISCOPE No. 25 by R&J BECK Ltd, 1918, with prismatic lens capable of extending to 23in. above the eyepiece, complete with wooden handle, in massive fitted leather case with carrying-strap.
A PERISCOPE No. 25 by R&J BECK Ltd, 1918, with prismatic lens capable of extending to 23in. above the eyepiece, complete with wooden handle, in massive fitted leather case with carrying-strap.