A large-format precision artillery observation binocular of the Imperial Japanese Army, marked 8×6.2°, No. 4021 with Imperial Arsenal acceptance star stamp. This periscope-style instrument was used throughout the war by Battery Commanders for observation without exposure to enemy fire. Complete with adjustable-height tripod with matching serial number; tripod legs fold, extend, and lock in place. The instrument features precision azimuth and elevation adjustment dials with graduated scales. Included: original brass/aluminum field tripod with azimuth head, ribbed aluminum transport case, and canvas cylindrical tripod carrier marked No. 1902 with original straps. Optics clear on both sides.