This solid brass optical tube appears to be a periscope-style viewing instrument, designed to let the user see over or around an obstacle while remaining concealed or stationary. Periscopes use angled reflective surfaces or lenses to redirect the line of sight when a direct view isn’t possible, a concept used in naval and military optics since at least the early 20th century.
Whether original or a high-quality vintage reproduction, it reflects the form and function of a classic optical device.
